continua.cc

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/* Copyright (C) 2001-2008
   Thomas Kuhn    <tkuhn@uni-bremen.de>
   Stefan Buehler <sbuehler@ltu.se>

   This program is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. */

#include <cmath>
#include "arts.h"
#include "matpackI.h"
#include "array.h"
#include "absorption.h"
#include "messages.h"
#include "continua.h"

// #################################################################################

// global constants as defined in constants.cc

extern const Numeric EULER_NUMBER;
extern const Numeric LOG10_EULER_NUMBER;
extern const Numeric NAT_LOG_TEN;
extern const Numeric PI;
extern const Numeric SPEED_OF_LIGHT;

// numerical constants specific defined for the file continua.cc

// conversion from neper to decibel:
//const Numeric Np_to_dB  = (10.000000 * LOG10_EULER_NUMBER); // [dB/Np]
// conversion from decibel to neper:
//const Numeric dB_to_Np  = (1.000000 / Np_to_dB);            // [Np/dB]
// conversion from GHz to Hz:
const Numeric GHz_to_Hz = 1.000000e9;                       // [Hz/GHz]
// conversion from Hz to GHz:
const Numeric Hz_to_GHz = 1.000000e-9;                      // [GHz/Hz]
// conversion from kPa to Pa:
const Numeric kPa_to_Pa = 1.000000e3;                       // [kPa/Pa]
// conversion from Pa to kPa:
const Numeric Pa_to_kPa = 1.000000e-3;                      // [Pa/kPa]
// conversion from hPa to Pa (hPa = mbar):
const Numeric hPa_to_Pa = 1.000000e2;                       // [hPa/Pa]
// conversion from Pa to hPa (hPa = mbar):
const Numeric Pa_to_hPa = 1.000000e-2;                      // [Pa/hPa]

// MPM pre-factor for unit setting:
const Numeric dB_m_Hz   = 0.1820427855916028e-06; // [dB/m/Hz]   (4 * pi / c) * 10 * log(e)
const Numeric dB_km_GHz = 0.1820427855916028e+06; // [dB/km/GHz] (4 * pi / c) * 10 * log(e)


// absorption unit conversions

// conversion from dB/km to Np/km for absorption units:
//const Numeric dB_km_to_Np_km = dB_to_Np;
// conversion from dB/km to Np/m for absorption units:
//const Numeric dB_km_to_Np_m  = (1.00000e-3 / (10.0 * LOG10_EULER_NUMBER));
// conversion from dB/km to 1/m for absorption units:
const Numeric dB_km_to_1_m   = (1.00000e-3 / (10.0 * LOG10_EULER_NUMBER));


// lower limit for absorption calculation due to underflow error:

const Numeric VMRCalcLimit = 1.000e-25;

// #################################################################################
// ############################## WATER VAPOR MODELS ###############################
// #################################################################################

void MPM87H2OAbsModel( MatrixView        pxsec,
                       const Numeric   CCin,       // continuum scale factor
           const Numeric   CLin,       // line strength scale factor
           const Numeric   CWin,       // line broadening scale factor
                       const String&     model,
           ConstVectorView   f_grid,
           ConstVectorView   abs_p,
           ConstVectorView   abs_t,
           ConstVectorView   vmr )
{
  //
  // Coefficients are from Liebe, Radio Science, 20(5), 1985, 1069
  //         0           1        2       3
  //         f0          b1       b2      b3
  //        [GHz]     [kHz/kPa]   [1]   [GHz/kPa]
  const Numeric mpm87[30][4] = {
    {    22.235080,    0.1090,  2.143,   27.84e-3},
    {    67.813960,    0.0011,  8.730,   27.60e-3},
    {   119.995940,    0.0007,  8.347,   27.00e-3},
    {   183.310117,    2.3000,  0.653,   31.64e-3},
    {   321.225644,    0.0464,  6.156,   21.40e-3},
    {   325.152919,    1.5400,  1.515,   29.70e-3},
    {   336.187000,    0.0010,  9.802,   26.50e-3},
    {   380.197372,   11.9000,  1.018,   30.36e-3},
    {   390.134508,    0.0044,  7.318,   19.00e-3},
    {   437.346667,    0.0637,  5.015,   13.70e-3},
    {   439.150812,    0.9210,  3.561,   16.40e-3},
    {   443.018295,    0.1940,  5.015,   14.40e-3},
    {   448.001075,   10.6000,  1.370,   23.80e-3},
    {   470.888947,    0.3300,  3.561,   18.20e-3},
    {   474.689127,    1.2800,  2.342,   19.80e-3},
    {   488.491133,    0.2530,  2.814,   24.90e-3},
    {   503.568532,    0.0374,  6.693,   11.50e-3},
    {   504.482692,    0.0125,  6.693,   11.90e-3},
    {   556.936002,  510.0000,  0.114,   30.00e-3},
    {   620.700807,    5.0900,  2.150,   22.30e-3},
    {   658.006500,    0.2740,  7.767,   30.00e-3},
    {   752.033227,  250.0000,  0.336,   28.60e-3},
    {   841.073593,    0.0130,  8.113,   14.10e-3},
    {   859.865000,    0.1330,  7.989,   28.60e-3},
    {   899.407000,    0.0550,  7.845,   28.60e-3},
    {   902.555000,    0.0380,  8.360,   26.40e-3},
    {   906.205524,    0.1830,  5.039,   23.40e-3},
    {   916.171582,    8.5600,  1.369,   25.30e-3},
    {   970.315022,    9.1600,  1.842,   24.00e-3},
    {   987.926764,  138.0000,  0.178,   28.60e-3}};

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM87 model (Radio Science, 20(5), 1985, 1069):
  const Numeric CC_MPM87 = 1.00000;
  const Numeric CL_MPM87 = 1.00000;
  const Numeric CW_MPM87 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW;
  if ( model == "MPM87" )
    {
      CC = CC_MPM87;
      CL = CL_MPM87;
      CW = CW_MPM87;
    }
  else if ( model == "MPM87Lines" )
    {
      CC = 0.000;
      CL = CL_MPM87;
      CW = CW_MPM87;
    }
  else if ( model == "MPM87Continuum" )
    {
      CC = CC_MPM87;
      CL = 0.000;
      CW = 0.000;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
    }
  else
    {
      ostringstream os;
      os << "H2O-MPM87: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM87', 'MPM87Lines', 'MPM87Continuum', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "H2O-MPM87: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";


  // number of lines of liebe line catalog (30 lines)
  const Index i_first = 0;
  const Index i_last  = 29;

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in [hPa] therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // here the total pressure is not multiplied by the H2O vmr for the
      // P_H2O calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pwv_dummy = Pa_to_kPa * abs_p[i];
      // relative inverse temperature [1]
      Numeric theta = (300.0 / abs_t[i]);
      // H2O partial pressure [kPa]
      Numeric pwv   = Pa_to_kPa * abs_p[i] * vmr[i];
      // dry air partial pressure [kPa]
      Numeric pda   = (Pa_to_kPa * abs_p[i]) - pwv;
      // H2O continuum absorption [dB/km/GHz2] like in the original MPM87
      Numeric Nppc  = CC * pwv_dummy * pow(theta, (Numeric)3.0) * 1.000e-5
        * ( (0.113 * pda) + (3.57 * pwv * pow(theta, (Numeric)7.8)) );

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff   = f_grid[s] * Hz_to_GHz;
    // H2O line contribution at position f
    Numeric Nppl = 0.000;

    // Loop over MPM89 H2O spectral lines
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [kHz]
        Numeric strength = CL * pwv_dummy * mpm87[l][1]
                * pow(theta,(Numeric)3.5) * exp(mpm87[l][2]*(1.000-theta));
        // line broadening parameter [GHz]
        Numeric gam      = CW * mpm87[l][3] *
                ( (4.80 * pwv * pow(theta, (Numeric)1.1)) +
                  (       pda * pow(theta, (Numeric)0.6)) );
        // effective line width with Doppler broadening [GHz]
        // gam              = sqrt(gam*gam + (2.14e-12 * mpm87[l][0] * mpm87[l][0] / theta));
        // H2O line absorption [dB/km/GHz] like in the original MPM87
        Nppl            += strength * MPMLineShapeFunction(gam, mpm87[l][0], ff);
      }
    // pxsec = abs/vmr [1/m] but MPM87 is in [dB/km] --> conversion necessary
    pxsec(s,i)  += dB_km_to_1_m * 0.1820 * ff * ( Nppl + (Nppc * ff) );
  }
    }
  return;
}
//
// #################################################################################

void MPM89H2OAbsModel( MatrixView        pxsec,
                       const Numeric   CCin,       // continuum scale factor
           const Numeric   CLin,       // line strength scale factor
           const Numeric   CWin,       // line broadening scale factor
           const String&     model,     // model
           ConstVectorView   f_grid,
           ConstVectorView   abs_p,
           ConstVectorView   abs_t,
           ConstVectorView   vmr )
{
  //
  // Coefficients are from Liebe, Int. J. Infrared and Millimeter Waves, 10(6), 1989, 631
  //         0           1        2       3        4      5      6
  //         f0          b1       b2      b3       b4     b5     b6
  //        [GHz]     [kHz/kPa]   [1]   [MHz/kPa]  [1]    [1]    [1]
  const Numeric mpm89[30][7] = {
    {    22.235080,    0.1090,  2.143,   28.11,   0.69,  4.80,  1.00},
    {    67.813960,    0.0011,  8.735,   28.58,   0.69,  4.93,  0.82},
    {   119.995940,    0.0007,  8.356,   29.48,   0.70,  4.78,  0.79},
    {   183.310074,    2.3000,  0.668,   28.13,   0.64,  5.30,  0.85},
    {   321.225644,    0.0464,  6.181,   23.03,   0.67,  4.69,  0.54},
    {   325.152919,    1.5400,  1.540,   27.83,   0.68,  4.85,  0.74},
    {   336.187000,    0.0010,  9.829,   26.93,   0.69,  4.74,  0.61},
    {   380.197372,   11.9000,  1.048,   28.73,   0.69,  5.38,  0.84},
    {   390.134508,    0.0044,  7.350,   21.52,   0.63,  4.81,  0.55},
    {   437.346667,    0.0637,  5.050,   18.45,   0.60,  4.23,  0.48},
    {   439.150812,    0.9210,  3.596,   21.00,   0.63,  4.29,  0.52},
    {   443.018295,    0.1940,  5.050,   18.60,   0.60,  4.23,  0.50},
    {   448.001075,   10.6000,  1.405,   26.32,   0.66,  4.84,  0.67},
    {   470.888947,    0.3300,  3.599,   21.52,   0.66,  4.57,  0.65},
    {   474.689127,    1.2800,  2.381,   23.55,   0.65,  4.65,  0.64},
    {   488.491133,    0.2530,  2.853,   26.02,   0.69,  5.04,  0.72},
    {   503.568532,    0.0374,  6.733,   16.12,   0.61,  3.98,  0.43},
    {   504.482692,    0.0125,  6.733,   16.12,   0.61,  4.01,  0.45},
    {   556.936002,  510.0000,  0.159,   32.10,   0.69,  4.11,  1.00},
    {   620.700807,    5.0900,  2.200,   24.38,   0.71,  4.68,  0.68},
    {   658.006500,    0.2740,  7.820,   32.10,   0.69,  4.14,  1.00},
    {   752.033227,  250.0000,  0.396,   30.60,   0.68,  4.09,  0.84},
    {   841.073593,    0.0130,  8.180,   15.90,   0.33,  5.76,  0.45},
    {   859.865000,    0.1330,  7.989,   30.60,   0.68,  4.09,  0.84},
    {   899.407000,    0.0550,  7.917,   29.85,   0.68,  4.53,  0.90},
    {   902.555000,    0.0380,  8.432,   28.65,   0.70,  5.10,  0.95},
    {   906.205524,    0.1830,  5.111,   24.08,   0.70,  4.70,  0.53},
    {   916.171582,    8.5600,  1.442,   26.70,   0.70,  4.78,  0.78},
    {   970.315022,    9.1600,  1.920,   25.50,   0.64,  4.94,  0.67},
    {   987.926764,  138.0000,  0.258,   29.85,   0.68,  4.55,  0.90}};

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM89 model
  // (Liebe, Int. J. Infrared and Millimeter Waves, 10(6), 1989, 631):
  const Numeric CC_MPM89 = 1.00000;
  const Numeric CL_MPM89 = 1.00000;
  const Numeric CW_MPM89 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model goes for values!!):
  Numeric CC, CL, CW;
  if ( model == "MPM89" )
    {
      CC = CC_MPM89;
      CL = CL_MPM89;
      CW = CW_MPM89;
    }
  else if ( model == "MPM89Lines" )
    {
      CC = 0.000;
      CL = CL_MPM89;
      CW = CW_MPM89;
    }
  else if ( model == "MPM89Continuum" )
    {
      CC = CC_MPM89;
      CL = 0.000;
      CW = 0.000;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
    }
  else
    {
      ostringstream os;
      os << "H2O-MPM89: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM89', 'MPM89Lines', 'MPM89Continuum', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "H2O-MPM89: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";


  // number of lines of Liebe line catalog (30 lines)
  const Index i_first = 0;
  const Index i_last  = 29;

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in [hPa] therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // here the total pressure is not multiplied by the H2O vmr for the
      // P_H2O calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pwv_dummy = Pa_to_kPa * abs_p[i];
      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [kPa]
      Numeric pwv       = Pa_to_kPa * abs_p[i] * vmr[i];
      // dry air partial pressure [kPa]
      Numeric pda       = (Pa_to_kPa * abs_p[i]) - pwv;
      // H2O continuum absorption [dB/km/GHz^2] like in the original MPM89
      Numeric Nppc      = CC * pwv_dummy * pow(theta, (Numeric)3.0) * 1.000e-5
        * ( (0.113 * pda) + (3.57 * pwv * pow(theta, (Numeric)7.5)) );

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff    = f_grid[s] * Hz_to_GHz;
    // H2O line contribution at position f
    Numeric Nppl  = 0.000;

    // Loop over MPM89 spectral lines:
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [kHz]
        Numeric strength = CL * pwv_dummy * mpm89[l][1]
                * pow(theta, (Numeric)3.5) * exp(mpm89[l][2]*(1.000-theta));
        // line broadening parameter [GHz]
        Numeric gam      = CW * mpm89[l][3] * 0.001
                * ( mpm89[l][5] * pwv * pow(theta, mpm89[l][6]) +
                          pda * pow(theta, mpm89[l][4]) );
        // Doppler line width [GHz]
        // Numeric gamd     = 1.46e-6 * mpm89[l][0] / sqrt(theta);
        // effective line width [GHz]
        // gam              = 0.535 * gam + sqrt(0.217*gam*gam + gamd*gamd);
        // H2O line absorption [dB/km/GHz] like in the original MPM89
        Nppl            += strength * MPMLineShapeFunction(gam, mpm89[l][0], ff);
      }
    // pxsec = abs/vmr [1/m] but MPM89 is in [dB/km] --> conversion necessary
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * ( Nppl + (Nppc * ff) );
  }
    }
  return;
}
//
// #################################################################################

void MPM02H2OAbsModel( MatrixView        pxsec,
                       const Numeric   CCin,       // continuum scale factor
           const Numeric   CLin,       // line strength scale factor
           const Numeric   CWin,       // line broadening scale factor
           const String&     model,
           ConstVectorView   f_grid,
           ConstVectorView   abs_p,
           ConstVectorView   abs_t,
           ConstVectorView   vmr )
{
  //
  /*
CTKS  OTHER DATA USED IF NOT FROM THEORETICAL CALC. IN A. BAUER ET AL. 41(1989)49-54:
CTKS  --------------------------------------------------------------------------------------------------------------
CTKS           | T=300 K       | T=300 K      |   T=300 K        |
CTKS  F     ISO|GWVHZO   NWVHZO| GWVNZ    NWVNZ|   GWVAIR   NWVAIR| REFERENCE
CTKS  GHZ   1  |MHZ/TORR 1     | MHZ/TORR 1    |   MHZ/TORR 1     |
CTKS  --------------------------------------------------------------------------------------------------------------
CTKS   22.2 1   18.00(18) -      4.10     --       3.77     --       LIEBE ET AL., J.CHEM.PHYS., 50(1969)727
CTKS  183.3 1   19.88    0.85    4.07(7)  0.63(10) 3.75(6)  0.64(10) A. BAUER ET AL. JQSRT 41(1989)49-54
CTKS  183.3 1    -        -      4.19(17) 0.74(3)  3.89(14) 0.76(3)  T. M. GOYETTE ET AL. J. MOLEC. SPEC, 143(1990)346
CTKS  203.4 2   --       --      4.214    0.93     3.833    0.89     J.-M. COLMONT ET AL. J. MOLEC. SPEC. 193(1999)233-243
CTKS  225.9 4   --       --      4.21     0.70     3.798    0.75     J.-M. COLMONT ET AL. J. MOLEC. SPEC. 193(1999)233-243
CTKS  241.6 4   --       --      4.45     0.77     4.08     0.80     J.-M. COLMONT ET AL. J. MOLEC. SPEC. 193(1999)233-243
CTKS  241.9 4   --       --      3.47     0.67     3.07     0.70     J.-M. COLMONT ET AL. J. MOLEC. SPEC. 193(1999)233-243
CTKS  325.1 1   --       --      4.011    0.63     3.633    0.64     J.-M. COLMONT ET AL. J. MOLEC. SPEC. 193(1999)233-243
CTKS  380.2 1   20.61(7) 0.89(1) 4.24(7)  0.52(14) 3.83(6)  0.54(14) A. BAUER ET AL. JQSRT 41(1987) 531
CTKS  380.2 1    -        -      4.16(4)  0.70(3)  3.80     0.72     T. M. GOYETTE ET AL. JQSRT 41(1993)485
CTKS  439.2 1   12.95(25)0.62(9)  --      --       --       --       V. N. MARKOV, J. MOLEC. SPEC, 164(1994)233
CTKS  752.0 1                    4.16(18) --       3.75     --       S. S. D. GASSTER ET AL. JOSA, 5(1988)593
CTKS  987.9 1                    4.42(23) --       4.01     --       S. S. D. GASSTER ET AL. JOSA, 5(1988)593
*/
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0             1        2       3        4       5      6
  //         f0            b1       b2      b3       b4      b5     b6
  //        [MHz]       [kHz/kPa]   [1]       [MHz/hPa]     [1]    [1]
  //                                        air      self   air    self
  const Numeric mpm02[35][7] = {
    {    22235.0800,    0.10947,  2.1678,   2.811,   4.80,  0.69,  0.61},
    {    67803.9600,    0.00111,  8.7518,   2.858,   4.93,  0.69,  0.82},
    {   119995.9400,    0.00072,  8.3688,   2.948,   4.78,  0.70,  0.79},
    {   183310.1170,    2.30351,  0.6794,   3.050,   5.30,  0.76,  0.85},
    {   321225.6400,    0.04646,  6.1792,   2.303,   4.69,  0.67,  0.54},
    {   325152.9190,    1.53869,  1.5408,   2.783,   4.85,  0.68,  0.74},
    {   336227.6200,    0.00099,  9.8233,   2.693,   4.74,  0.64,  0.61},
    {   380197.3720,    11.9079,  1.0439,   2.873,   5.38,  0.72,  0.89},
    {   390134.5080,    0.00437,  7.3408,   2.152,   4.81,  0.63,  0.55},
    {   437346.6670,    0.06378,  5.0384,   1.845,   4.23,  0.60,  0.48},
    {   439150.8120,    0.92144,  3.5853,   2.100,   4.29,  0.63,  0.62},
    {   443018.2950,    0.19384,  5.0384,   1.860,   4.23,  0.60,  0.50},
    {   448001.0750,    10.6190,  1.3952,   2.632,   4.84,  0.66,  0.67},
    {   470888.9470,    0.33005,  3.5853,   2.152,   4.57,  0.66,  0.65},
    {   474689.1270,    1.27660,  2.3674,   2.355,   4.65,  0.65,  0.64},
    {   488491.1330,    0.25312,  2.8391,   2.602,   5.04,  0.69,  0.72},
    {   503568.5320,    0.03746,  6.7158,   1.612,   3.98,  0.61,  0.43},
    {   504482.6920,    0.01250,  6.7158,   1.612,   4.01,  0.61,  0.45},
    {   547676.4400,    1.01467,  0.1427,   2.600,   4.50,  0.69,  1.00}, // *
    {   552020.9600,    0.18668,  0.1452,   2.600,   4.50,  0.69,  1.00}, // *
    {   556936.0020,  510.51086,  0.1405,   3.210,   4.11,  0.69,  1.00},
    {   620700.8070,    5.10539,  2.3673,   2.438,   4.68,  0.71,  0.68},
    {   645905.6200,    0.00667,  8.6065,   1.800,   4.00,  0.60,  0.43},
    {   658006.5500,    0.27451,  7.7889,   3.210,   4.14,  0.69,  1.00},
    {   752033.2270,  249.68466,  0.3625,   3.060,   4.09,  0.68,  0.84},
    {   841051.1620,    0.01308,  8.1347,   1.590,   5.76,  0.33,  0.45},
    {   859965.6490,    0.13326,  8.0114,   3.060,   4.09,  0.68,  0.84},
    {   899302.1710,    0.05492,  7.8676,   2.985,   4.53,  0.68,  0.90},
    {   902609.4360,    0.03854,  8.3823,   2.865,   5.10,  0.70,  0.95},
    {   906206.1180,    0.18323,  5.0628,   2.408,   4.70,  0.70,  0.53},
    {   916171.5820,    8.56444,  1.3943,   2.670,   4.78,  0.70,  0.78},
    {   923113.1900,    0.00784, 10.2441,   2.900,   5.00,  0.66,  0.67},
    {   970315.0220,    9.16280,  1.8673,   2.550,   4.94,  0.64,  0.67},
    {   987926.7640,  138.28461,  0.2045,   2.985,   4.55,  0.68,  0.90},
  //--------------------------------------------------------------------
    {  1780.000000, 2230.00000,  0.952,  17.620,  30.50,  2.00,  5.00}}; // pseudo continuum line

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21)
  const Numeric CC_MPM02 = 1.00000;
  const Numeric CL_MPM02 = 1.00000;
  const Numeric CW_MPM02 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW;
  // number of lines of Liebe line catalog (0-33 lines, 34 cont. pseudo line)
  Index i_first = 0;
  Index i_last  = 34;
  if ( model == "MPM02" )
    {
      CC      = CC_MPM02;
      CL      = CL_MPM02;
      CW      = CW_MPM02;
      i_first = 0;
      i_last  = 34;
    }
  else if ( model == "MPM02Lines" )
    {
      CC      = 0.000;
      CL      = CL_MPM02;
      CW      = CW_MPM02;
      i_first = 0;
      i_last  = 33;
    }
  else if ( model == "MPM02Continuum" )
    {
      CC      = CC_MPM02;
      CL      = 0.000;
      CW      = 0.000;
      i_first = 34;
      i_last  = 34;
    }
  else if ( model == "user" )
    {
      CC      = CCin;
      CL      = CLin;
      CW      = CWin;
      i_first = 0;
      i_last  = 34;

    }
  else
    {
      ostringstream os;
      os << "H2O-MPM02: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM02', 'MPM02Lines', 'MPM02Continuum', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "H2O-MPM02: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // here the total pressure is not multiplied by the H2O vmr for the
      // P_H2O calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pwv_dummy = Pa_to_hPa * abs_p[i];
      // relative inverse temperature [1]
      Numeric theta    = (300.0 / abs_t[i]);
      // H2O partial pressure [hPa]
      Numeric pwv      = Pa_to_hPa * abs_p[i] * vmr[i];
      // dry air partial pressure [hPa]
      Numeric pda      = (Pa_to_hPa * abs_p[i]) - pwv;
      // Loop over MPM02 spectral lines:

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;

    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]. The missing vmr of H2O will be multiplied
        // at the stage of absorption calculation: abs / vmr * pxsec.
        Numeric strength = 0.00;
        Numeric gam = 0.00;
        if ( (l >= 0) && (l <= 33) ) // ---- just the lines ------------------
    {
      strength = CL * pwv_dummy * mpm02[l][1] *
                pow(theta, (Numeric)3.5)  * exp(mpm02[l][2]*(1.0-theta));
      // line broadening parameter [GHz]
      gam      = CW * mpm02[l][3] * 0.001 *
                      ( (mpm02[l][4] * pwv * pow(theta, mpm02[l][6])) +
                      (                pda * pow(theta, mpm02[l][5])) );
    }
        else if ( l == 34 ) // ----- just the continuum pseudo-line ----------
    {
      strength = CC * pwv_dummy * mpm02[l][1] *
                      pow(theta, (Numeric)3.5)  * exp(mpm02[l][2]*(1.0-theta));
      // line broadening parameter [GHz]
      gam      = mpm02[l][3] * 0.001 *
                       ( (mpm02[l][4] * pwv * pow(theta, mpm02[l][6])) +
                       (                pda * pow(theta, mpm02[l][5])) );
    }
        else // ----- if something strange happens ---------------------------
    {
      ostringstream os;
      os << "H2O-MPM02: wrong line number detected l=" << l << " (0-34)\n";
      throw runtime_error(os.str());
      return;
    } // ---------------------------------------------------------------
        // Doppler line width [GHz]
        // Numeric gamd     = 1.46e-6 * mpm02[l][0] / sqrt(theta);
        // effective line width [GHz]
        //gam              = 0.535 * gam + sqrt(0.217*gam*gam + gamd*gamd);
        // absorption [dB/km] like in the original MPM02
        Numeric Npp = strength * MPMLineShapeFunction(gam, mpm02[l][0], ff);
        // pxsec = abs/vmr [1/m] but MPM89 is in [dB/km] --> conversion necessary
        pxsec(s,i)   += dB_km_to_1_m * 0.1820 * ff * Npp;
      }
  }
    }
  return;
}
//
//
// #################################################################################

void MPM93H2OAbsModel( MatrixView        pxsec,
                       const Numeric   CCin,       // continuum scale factor
           const Numeric   CLin,       // line strength scale factor
           const Numeric   CWin,       // line broadening scale factor
           const String&     model,
           ConstVectorView   f_grid,
           ConstVectorView   abs_p,
           ConstVectorView   abs_t,
           ConstVectorView   vmr )
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0           1        2       3        4      5      6
  //         f0          b1       b2      b3       b4     b5     b6
  //        [GHz]     [kHz/hPa]   [1]   [MHz/hPa]  [1]    [1]    [1]
  const Numeric mpm93[35][7] = {
    {    22.235080,    0.01130,  2.143,   2.811,   4.80,  0.69,  1.00},
    {    67.803960,    0.00012,  8.735,   2.858,   4.93,  0.69,  0.82},
    {   119.995940,    0.00008,  8.356,   2.948,   4.78,  0.70,  0.79},
    {   183.310091,    0.24200,  0.668,   3.050,   5.30,  0.64,  0.85},
    {   321.225644,    0.00483,  6.181,   2.303,   4.69,  0.67,  0.54},
    {   325.152919,    0.14990,  1.540,   2.783,   4.85,  0.68,  0.74},
    {   336.222601,    0.00011,  9.829,   2.693,   4.74,  0.69,  0.61},
    {   380.197372,    1.15200,  1.048,   2.873,   5.38,  0.54,  0.89},
    {   390.134508,    0.00046,  7.350,   2.152,   4.81,  0.63,  0.55},
    {   437.346667,    0.00650,  5.050,   1.845,   4.23,  0.60,  0.48},
    {   439.150812,    0.09218,  3.596,   2.100,   4.29,  0.63,  0.52},
    {   443.018295,    0.01976,  5.050,   1.860,   4.23,  0.60,  0.50},
    {   448.001075,    1.03200,  1.405,   2.632,   4.84,  0.66,  0.67},
    {   470.888947,    0.03297,  3.599,   2.152,   4.57,  0.66,  0.65},
    {   474.689127,    0.12620,  2.381,   2.355,   4.65,  0.65,  0.64},
    {   488.491133,    0.02520,  2.853,   2.602,   5.04,  0.69,  0.72},
    {   503.568532,    0.00390,  6.733,   1.612,   3.98,  0.61,  0.43},
    {   504.482692,    0.00130,  6.733,   1.612,   4.01,  0.61,  0.45},
//    {   547.676440,    0.97010,  0.114,   2.600,   4.50,  0.70,  1.00},
//    {   552.020960,    1.47700,  0.114,   2.600,   4.50,  0.70,  1.00},
    {   547.676440,    0.97010*0.00199983,  0.114,   2.600,   4.50,  0.70,  1.00}, // isotopic ratio multiplied
    {   552.020960,    1.47700*0.00037200,  0.114,   2.600,   4.50,  0.70,  1.00}, // isotopic ratio multiplied
    {   556.936002,   48.74000,  0.159,   3.210,   4.11,  0.69,  1.00},
    {   620.700807,    0.50120,  2.200,   2.438,   4.68,  0.71,  0.68},
    {   645.866155,    0.00713,  8.580,   1.800,   4.00,  0.60,  0.50}, // ?? JPL tag 18003 (H2O) f_o = 645.7660100GHz
    {   658.005280,    0.03022,  7.820,   3.210,   4.14,  0.69,  1.00},
    {   752.033227,   23.96000,  0.396,   3.060,   4.09,  0.68,  0.84},
    {   841.053973,    0.00140,  8.180,   1.590,   5.76,  0.33,  0.45},
    {   859.962313,    0.01472,  7.989,   3.060,   4.09,  0.68,  0.84},
    {   899.306675,    0.00605,  7.917,   2.985,   4.53,  0.68,  0.90},
    {   902.616173,    0.00426,  8.432,   2.865,   5.10,  0.70,  0.95},
    {   906.207325,    0.01876,  5.111,   2.408,   4.70,  0.70,  0.53},
    {   916.171582,    0.83400,  1.442,   2.670,   4.78,  0.70,  0.78},
    {   923.118427,    0.00869, 10.220,   2.900,   5.00,  0.70,  0.80},
    {   970.315022,    0.89720,  1.920,   2.550,   4.94,  0.64,  0.67},
    {   987.926764,   13.21000,  0.258,   2.985,   4.55,  0.68,  0.90},
  //--------------------------------------------------------------------
    {  1780.000000, 2230.00000,  0.952,  17.620,  30.50,  2.00,  5.00}}; // pseudo continuum line

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21)
  const Numeric CC_MPM93 = 1.00000;
  const Numeric CL_MPM93 = 1.00000;
  const Numeric CW_MPM93 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW;
  // number of lines of Liebe line catalog (0-33 lines, 34 cont. pseudo line)
  Index i_first = 0;
  Index i_last  = 34;
  if ( model == "MPM93" )
    {
      CC      = CC_MPM93;
      CL      = CL_MPM93;
      CW      = CW_MPM93;
      i_first = 0;
      i_last  = 34;
    }
  else if ( model == "MPM93Lines" )
    {
      CC      = 0.000;
      CL      = CL_MPM93;
      CW      = CW_MPM93;
      i_first = 0;
      i_last  = 33;
    }
  else if ( model == "MPM93Continuum" )
    {
      CC      = CC_MPM93;
      CL      = 0.000;
      CW      = 0.000;
      i_first = 34;
      i_last  = 34;
    }
  else if ( model == "user" )
    {
      CC      = CCin;
      CL      = CLin;
      CW      = CWin;
      i_first = 0;
      i_last  = 34;

    }
  else
    {
      ostringstream os;
      os << "H2O-MPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93', 'MPM93Lines', 'MPM93Continuum', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "H2O-MPM93: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // here the total pressure is not multiplied by the H2O vmr for the
      // P_H2O calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pwv_dummy = Pa_to_hPa * abs_p[i];
      // relative inverse temperature [1]
      Numeric theta    = (300.0 / abs_t[i]);
      // H2O partial pressure [hPa]
      Numeric pwv      = Pa_to_hPa * abs_p[i] * vmr[i];
      // dry air partial pressure [hPa]
      Numeric pda      = (Pa_to_hPa * abs_p[i]) - pwv;
      // Loop over MPM93 spectral lines:

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;

    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]. The missing vmr of H2O will be multiplied
        // at the stage of absorption calculation: abs / vmr * pxsec.
        Numeric strength = 0.00;
        Numeric gam = 0.00;
        if ( (l >= 0) && (l <= 33) ) // ---- just the lines ------------------
    {
      strength = CL * pwv_dummy * mpm93[l][1]
                    * pow(theta, (Numeric)3.5)  * exp(mpm93[l][2]*(1.0-theta));
      // line broadening parameter [GHz]
      gam      = CW * mpm93[l][3] * 0.001 *
                      ( (mpm93[l][4] * pwv * pow(theta, mpm93[l][6])) +
                      (                pda * pow(theta, mpm93[l][5])) );
    }
        else if ( l == 34 ) // ----- just the continuum pseudo-line ----------
    {
      strength = CC * pwv_dummy * mpm93[l][1]
                    * pow(theta, (Numeric)3.5)  * exp(mpm93[l][2]*(1.0-theta));
      // line broadening parameter [GHz]
      gam      = mpm93[l][3] * 0.001 *
                       ( (mpm93[l][4] * pwv * pow(theta, mpm93[l][6])) +
                       (                pda * pow(theta, mpm93[l][5])) );
    }
        else // ----- if something strange happens ---------------------------
    {
      ostringstream os;
      os << "H2O-MPM93: wrong line number detected l=" << l << " (0-34)\n";
      throw runtime_error(os.str());
      return;
    } // ---------------------------------------------------------------
        // Doppler line width [GHz]
        // Numeric gamd     = 1.46e-6 * mpm93[l][0] / sqrt(theta);
        // effective line width [GHz]
        //gam              = 0.535 * gam + sqrt(0.217*gam*gam + gamd*gamd);
        // absorption [dB/km] like in the original MPM93
        Numeric Npp = strength * MPMLineShapeFunction(gam, mpm93[l][0], ff);
        // pxsec = abs/vmr [1/m] but MPM89 is in [dB/km] --> conversion necessary
        pxsec(s,i)   += dB_km_to_1_m * 0.1820 * ff * Npp;
      }
  }
    }
  return;
}
//
// #################################################################################

void PWR98H2OAbsModel( MatrixView        pxsec,
           const Numeric   CCin,       // continuum scale factor
           const Numeric   CLin,       // line strength scale factor
           const Numeric   CWin,       // line broadening scale factor
           const String&     model,
           ConstVectorView   f_grid,
           ConstVectorView   abs_p,
           ConstVectorView   abs_t,
           ConstVectorView   vmr )
{
  //   REFERENCES:
  //   LINE INTENSITIES FROM HITRAN92 (SELECTION THRESHOLD=
  //     HALF OF CONTINUUM ABSORPTION AT 1000 MB).
  //   WIDTHS MEASURED AT 22,183,380 GHZ, OTHERS CALCULATED:
  //     H.J.LIEBE AND T.A.DILLON, J.CHEM.PHYS. V.50, PP.727-732 (1969) &
  //     H.J.LIEBE ET AL., JQSRT V.9, PP. 31-47 (1969)  (22GHz);
  //     A.BAUER ET AL., JQSRT V.37, PP.531-539 (1987) &
  //     ASA WORKSHOP (SEPT. 1989) (380GHz);
  //     AND A.BAUER ET AL., JQSRT V.41, PP.49-54 (1989) (OTHER LINES).
  //   AIR-BROADENED CONTINUUM BASED ON LIEBE & LAYTON, NTIA
  //     REPORT 87-224 (1987); SELF-BROADENED CONTINUUM BASED ON
  //     LIEBE ET AL, AGARD CONF. PROC. 542 (MAY 1993),
  //     BUT READJUSTED FOR LINE SHAPE OF
  //     CLOUGH et al, ATMOS. RESEARCH V.23, PP.229-241 (1989).
  //
  // Coefficients are from P. W. Rosenkranz., Radio Science, 33(4), 919, 1998
  // line frequencies [GHz]
  const Numeric PWRfl[15] = {  22.2350800, 183.3101170, 321.2256400, 325.1529190, 380.1973720,
                              439.1508120, 443.0182950, 448.0010750, 470.8889470,  474.6891270,
                              488.4911330, 556.9360020,  620.7008070, 752.0332270, 916.1715820 };
  // line intensities at 300K [Hz * cm2] (see Janssen Appendix to Chap.2 for this)
  const Numeric PWRs1[15] = { 1.31e-14,  2.273e-12, 8.036e-14, 2.694e-12, 2.438e-11,
                              2.179e-12, 4.624e-13, 2.562e-11, 8.369e-13, 3.263e-12,
                              6.659e-13, 1.531e-9,  1.707e-11, 1.011e-9,  4.227e-11 };
  // T coeff. of intensities [1]
  const Numeric PWRb2[15] = { 2.144, 0.668, 6.179, 1.541, 1.048,
                              3.595, 5.048, 1.405, 3.597, 2.379,
                              2.852, 0.159, 2.391, 0.396, 1.441 };
  // air-broadened width parameters at 300K [GHz/hPa]
  const Numeric PWRw3[15] = { 0.00281, 0.00281, 0.00230, 0.00278, 0.00287,
                              0.00210, 0.00186, 0.00263, 0.00215, 0.00236,
                              0.00260, 0.00321, 0.00244, 0.00306, 0.00267 };
  // T-exponent of air-broadening [1]
  const Numeric PWRx[15]  = { 0.69, 0.64, 0.67, 0.68, 0.54,
                              0.63, 0.60, 0.66, 0.66, 0.65,
                  0.69, 0.69, 0.71, 0.68, 0.70 };
  // self-broadened width parameters at 300K [GHz/hPa]
  const Numeric PWRws[15] = { 0.01349, 0.01491, 0.01080, 0.01350, 0.01541,
                              0.00900, 0.00788, 0.01275, 0.00983, 0.01095,
                              0.01313, 0.01320, 0.01140, 0.01253, 0.01275 };

  // T-exponent of self-broadening [1]
  const Numeric PWRxs[15] = { 0.61, 0.85, 0.54, 0.74, 0.89,
            0.52, 0.50, 0.67, 0.65, 0.64,
            0.72, 1.00, 0.68, 0.84, 0.78 };

   // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM87 model (P. W. Rosenkranz., Radio Science, 33(4), 919, 1998):
  const Numeric CC_PWR98 = 1.00000;
  const Numeric CL_PWR98 = 1.00000;
  const Numeric CW_PWR98 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW;
  if ( model == "Rosenkranz" )
    {
      CC = CC_PWR98;
      CL = CL_PWR98;
      CW = CW_PWR98;
    }
  else if ( model == "RosenkranzLines" )
    {
      CC = 0.000;
      CL = CL_PWR98;
      CW = CW_PWR98;
    }
  else if ( model == "RosenkranzContinuum" )
    {
      CC = CC_PWR98;
      CL = 0.000;
      CW = 0.000;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
    }
  else
    {
      ostringstream os;
      os << "H2O-PWR98: ERROR! Wrong model values given.\n"
   << "Valid models are: 'Rosenkranz', 'RosenkranzLines', 'RosenkranzContinuum', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "H2O-PWR98: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // here the total pressure is not multiplied by the H2O vmr for the
      // P_H2O calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pvap_dummy = Pa_to_hPa * abs_p[i];
      // water vapor partial pressure [hPa]
      Numeric pvap       = Pa_to_hPa * abs_p[i] * vmr[i];
      // dry air partial pressure [hPa]
      Numeric pda        = (Pa_to_hPa * abs_p[i]) - pvap;
      // Rosenkranz number density  (Rosenkranz H2O mass density in [g/m³])
      // [g/m³]    =  [g*K / Pa*m³]  *  [Pa/K]
      // rho       =   (M_H2O / R)   *  (P_H2O / T)
      // rho       =      2.1667     *  abs_p * vmr / abs_t
      // den       = 3.335e16 * rho
      // FIXME Numeric den        = 3.335e16 * (2.1667 * abs_p[i] * vmr[i] / abs_t[i]);
      Numeric den_dummy  = 3.335e16 * (2.1667 * abs_p[i] / abs_t[i]);
      // inverse relative temperature [1]
      Numeric ti         = (300.0 / abs_t[i]);
      Numeric ti2        = pow(ti, (Numeric)2.5);

      // continuum term [Np/km/GHz2]
      Numeric con = CC * pvap_dummy * pow(ti, (Numeric)3.0) * 1.000e-9
        * ( (0.543 * pda) + (17.96 * pvap * pow(ti, (Numeric)4.5)) );

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff  = f_grid[s] * Hz_to_GHz;
    // line contribution at position f
    Numeric sum = 0.000;

    // Loop over spectral lines
    for (Index l = 0; l < 15; l++)
      {
        Numeric width    = ( CW * PWRw3[l] * pda  * pow(ti, PWRx[l]) ) +
         (      PWRws[l] * pvap * pow(ti, PWRxs[l]));
        //        Numeric width    = CW * ( PWRw3[l] * pda  * pow(ti, PWRx[l]) +
        //          PWRws[l] * pvap * pow(ti, PWRxs[l]) );
        Numeric wsq      = width * width;
        Numeric strength = CL * PWRs1[l] * ti2 * exp(PWRb2[l]*(1.0 - ti));
        // frequency differences
        Numeric df0      = ff - PWRfl[l];
        Numeric df1      = ff + PWRfl[l];
        // use Clough's definition of local line contribution
        Numeric base     = width / (wsq + 562500.000);
        // positive and negative resonances
        Numeric res      = 0.000;
        if (fabs(df0) < 750.0) res += width / (df0*df0 + wsq) - base;
        if (fabs(df1) < 750.0) res += width / (df1*df1 + wsq) - base;
        sum             += strength * res * pow( (ff/PWRfl[l]),
                                                       (Numeric)2.0 );
      }
    // line term [Np/km]
    Numeric absl = 0.3183e-4 * den_dummy * sum;
    // pxsec = abs/vmr [1/m] (Rosenkranz model in [Np/km])
    // 4.1907e-5 = 0.230259 * 0.1820 * 1.0e-3    (1/(10*log(e)) = 0.230259)
    pxsec(s,i)  += 1.000e-3 * ( absl + (con * ff * ff) );
  }
    }
  return;
}
//
// #################################################################################
//

void CP98H2OAbsModel( MatrixView        pxsec,
                      const Numeric  CCin,       // continuum scale factor
          const Numeric     CLin,       // line strength scale factor
          const Numeric  CWin,       // line broadening scale factor
          const String&     model,
          ConstVectorView   f_grid,
          ConstVectorView   abs_p,
          ConstVectorView   abs_t,
          ConstVectorView   vmr )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the CP98 model (S. L. Cruz-Pol et al., Radio Science, 33(5), 1319, 1998):
  const Numeric CC_CP98 = 1.2369; // +/- 0.155  !LARGE!
  const Numeric CL_CP98 = 1.0639; // +/- 0.016
  const Numeric CW_CP98 = 1.0658; // +/- 0.0096
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW;
  if ( model == "CruzPol" )
    {
      CC = CC_CP98;
      CL = CL_CP98;
      CW = CW_CP98;
    }
  else if ( model == "CruzPolLine" )
    {
      CC = 0.000;
      CL = CL_CP98;
      CW = CW_CP98;
    }
  else if ( model == "CruzPolContinuum" )
    {
      CC = CC_CP98;
      CL = 0.000;
      CW = 0.000;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
    }
  else
    {
      ostringstream os;
      os << "H2O-CP98: ERROR! Wrong model values given.\n"
   << "Valid models are: 'CruzPol', 'CruzPolLine', 'CruzPolContinuum', and 'user'" << "\n";
      throw runtime_error(os.str());
    }
  out3  << "H2O-CP98: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in [hPa] therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // calculate pxsec only if VMR(H2O) > VMRCalcLimit
      if (vmr[i] > VMRCalcLimit)
  {
    // relative inverse temperature [1]
    Numeric theta = (300.0 / abs_t[i]);
    // H2O partial pressure [hPa]
    Numeric pwv   = Pa_to_hPa * abs_p[i] * vmr[i];
    // dry air partial pressure [hPa]
    Numeric pda   = (Pa_to_hPa * abs_p[i]) - pwv;
    // line strength
    Numeric TL    = CL * 0.0109 * pwv * pow(theta,(Numeric)3.5)
            * exp(2.143*(1.0-theta));
    // line broadening parameter [GHz]
    Numeric gam   = CW * 0.002784 *
                    ( (pda * pow(theta,(Numeric)0.6))
                            + (4.80 * pwv * pow(theta,(Numeric)1.1)) );
    // continuum term
    Numeric TC    = CC * pwv * pow(theta, (Numeric)3.0) * 1.000e-7
            * ( (0.113 * pda) + (3.57 * pwv * pow(theta,(Numeric)7.5)) );

    // Loop over input frequency
    for ( Index s=0; s<n_f; ++s )
      {
        // input frequency in [GHz]
        Numeric ff  = f_grid[s] * Hz_to_GHz;
        Numeric TSf = MPMLineShapeFunction(gam, 22.235080, ff);
        // pxsec = abs/vmr [1/m] (Cruz-Pol model in [Np/km])
        pxsec(s,i) += 4.1907e-5 * ff * ( (TL * TSf) + (ff * TC) ) / vmr[i];
      }
  }
    }
  return;
}
//
// #################################################################################

void Standard_H2O_self_continuum( MatrixView        pxsec,
          const Numeric     Cin,
          const Numeric     xin,
          const String&     model,
          ConstVectorView   f_grid,
          ConstVectorView   abs_p,
          ConstVectorView   abs_t,
          ConstVectorView   vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Rosenkranz model (Radio Science, 33(4), 919, 1998):
  const Numeric Cs_PWR   = 1.796e-33;  //  [1/m / (Hz²*Pa²)]
  const Numeric xs_PWR   = 4.5;        //  [1]
  // standard values for the Cruz-Pol model (Radio Science, 33(5), 1319, 1998):
  const Numeric Cs_CP    = 1.851e-33;  //  [1/m / (Hz²*Pa²)]
  const Numeric xs_CP    = 7.5;        //  [1]
  // standard values for the MPM89 model (Int. J. Inf. and Millim. Waves, 10(6), 1989, 631):
  const Numeric Cs_MPM89 = 1.500e-33;  //  [1/m / (Hz²*Pa²)]
  const Numeric xs_MPM89 = 7.5;        //  [1]
  // standard values for the MPM87 model (Radio Science, 20(5), 1985, 1069):
  const Numeric Cs_MPM87 = 1.500e-33;  //  [1/m / (Hz²*Pa²)]
  const Numeric xs_MPM87 = 7.5;        //  [1]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model goes for values!!):
  Numeric C, x;
   if ( model == "Rosenkranz" )
     {
       C = Cs_PWR;
       x = xs_PWR;
     }
   else if ( model == "CruzPol" )
     {
       C = Cs_CP;
       x = xs_CP;
     }
   else if ( model == "MPM89" )
     {
       C = Cs_MPM89;
       x = xs_MPM89;
     }
   else if ( model == "MPM87" )
     {
       C = Cs_MPM87;
       x = xs_MPM87;
     }
   else if ( model == "user" )
     {
       C = Cin;
       x = xin;
     }
   else
     {
       ostringstream os;
       os << "H2O-SelfContStandardType: ERROR! Wrong model values given.\n"
    << "allowed models are: 'Rosenkranz', 'CruzPol', 'MPM89', 'MPM87', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "H2O-SelfContStandardType: (model=" << model << ") parameter values in use:\n"
         << " C_s = " << C << "\n"
         << " x_s = " << x << "\n";



  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      // Dummy scalar holds everything except the quadratic frequency dependence.
      // The second vmr of H2O will be multiplied at the stage of absorption
      // calculation: abs = vmr * pxsec.
      Numeric dummy =
  C * pow( (Numeric)300./abs_t[i], x+(Numeric)3. )
        * pow( abs_p[i], (Numeric)2. ) * vmr[i];

      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    pxsec(s,i) += dummy * pow( f_grid[s], (Numeric)2. );
    //    cout << "pxsec(" << s << "," << i << "): " << pxsec(s,i) << "\n";
  }
    }
}
//
// #################################################################################

void Standard_H2O_foreign_continuum( MatrixView        pxsec,
             const Numeric     Cin,
             const Numeric     xin,
             const String&     model,
             ConstVectorView   f_grid,
             ConstVectorView   abs_p,
             ConstVectorView   abs_t,
             ConstVectorView   vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Rosenkranz model (Radio Science, 33(4), 919, 1998):
  const Numeric Cf_PWR   = 5.43e-35 ;  //  [1/m / (Hz²*Pa²)]
  const Numeric xf_PWR   = 0.0;        //  [1]
  // standard values for the Cruz-Pol model (Radio Science, 33(5), 1319, 1998):
  const Numeric Cf_CP    = 5.85e-35;  //  [1/m / (Hz²*Pa²)]
  const Numeric xf_CP    = 0.0;        //  [1]
  // standard values for the MPM89 model (Int. J. Inf. and Millim. Waves, 10(6), 1989, 631):
  const Numeric Cf_MPM89 = 4.74e-35;  //  [1/m / (Hz²*Pa²)]
  const Numeric xf_MPM89 = 0.0;        //  [1]
  // standard values for the MPM87 model (Radio Science, 20(5), 1985, 1069):
  const Numeric Cf_MPM87 = 4.74e-35;  //  [1/m / (Hz²*Pa²)]
  const Numeric xf_MPM87 = 0.0;        //  [1]
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model goes for values!!):
  Numeric C, x;
   if ( model == "Rosenkranz" )
     {
       C = Cf_PWR;
       x = xf_PWR;
     }
   else if ( model == "CruzPol" )
     {
       C = Cf_CP;
       x = xf_CP;
     }
   else if ( model == "MPM89" )
     {
       C = Cf_MPM89;
       x = xf_MPM89;
     }
   else if ( model == "MPM87" )
     {
       C = Cf_MPM87;
       x = xf_MPM87;
     }
   else if ( model == "user" )
     {
       C = Cin;
       x = xin;
     }
   else
     {
       ostringstream os;
       os << "H2O-ForeignContStandardType: ERROR! Wrong model values given.\n"
    << "allowed models are: 'Rosenkranz', 'CruzPol', 'MPM89', 'MPM87', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "H2O-ForeignContStandardType: (model=" << model << ") parameter values in use:\n"
         << " C_s = " << C << "\n"
         << " x_s = " << x << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // Dry air partial pressure: p_dry := p_tot - p_h2o.
      Numeric pdry  = abs_p[i] * (1.000e0-vmr[i]);
      // Dummy scalar holds everything except the quadratic frequency dependence.
      // The vmr of H2O will be multiplied at the stage of absorption
      // calculation: abs = vmr * pxsec.
      Numeric dummy = C * pow( (Numeric)300./abs_t[i], x+(Numeric)3. )
        * abs_p[i] * pdry;

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    pxsec(s,i) += dummy * pow( f_grid[s], (Numeric)2. );
    //    cout << "pxsec(" << s << "," << i << "): " << pxsec(s,i) << "\n";
  }
    }
}
//
//
// #################################################################################

void MaTipping_H2O_foreign_continuum( MatrixView        pxsec,
              const Numeric   Cin,
              const Numeric   xin,
              const String&     model,
              ConstVectorView   f_grid,
              ConstVectorView   abs_p,
              ConstVectorView   abs_t,
              ConstVectorView   vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for Q. Ma and R. H. Tipping, J. Chem. Phys., 117(23), 10581, 2002:
  // the Cf value is originally given in dB/km/kPa^2/GHz^2.0389. the conversion factor is
  // then 1.0283E-28 to get arts units. Additionally the Cf value is divided by 1.08 to
  // get the Cf for air.
  const Numeric Cf_MaTipping = 1.8590e-35;   //  [1/m / (Hz²*Pa²)]
  const Numeric xf_MaTipping = 4.6019;       //  [1]
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model goes for values!!):
  Numeric C, x;
   if ( model == "MaTipping" )
     {
       C = Cf_MaTipping;
       x = xf_MaTipping;
     }
   else if ( model == "user" )
     {
       C = Cin;
       x = xin;
     }
   else
     {
       ostringstream os;
       os << "H2O-MaTipping_H2O_foreign_continuum: ERROR! Wrong model values given.\n"
    << "allowed models are: 'MaTipping', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "H2O-MaTipping_H2O_foreign_continuum: (model=" << model << ") parameter values in use:\n"
         << " C_s = " << C << "\n"
         << " x_s = " << x << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // Dry air partial pressure: p_dry := p_tot - p_h2o.
      Numeric pdry  = abs_p[i] * (1.000e0-vmr[i]);
      // Dummy scalar holds everything except the quadratic frequency dependence.
      // The vmr of H2O will be multiplied at the stage of absorption
      // calculation: abs = vmr * pxsec.
      Numeric dummy = C * pow( (Numeric)300./abs_t[i], x )
        * abs_p[i] * pdry;

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    pxsec(s,i) += dummy * pow( f_grid[s], (Numeric)2.0389 );
    //    cout << "pxsec(" << s << "," << i << "): " << pxsec(s,i) << "\n";
  }
    }
}
//
// #################################################################################



// =================================================================================


Numeric XINT_FUN( const Numeric V1A,
                  const Numeric /* V2A */,
                  const Numeric DVA,
                  const Numeric A[],
                  const Numeric VI)
{

// ----------------------------------------------------------------------
  //     THIS SUBROUTINE INTERPOLATES THE A ARRAY STORED
  //     FROM V1A TO V2A IN INCREMENTS OF DVA INTO XINT
// ----------------------------------------------------------------------

  const Numeric ONEPL  = 1.001;     // original value given in F77 code
  // FIXME const Numeric ONEMI  = 0.999;     // original value given in F77 code

  //const Numeric ONEPL  = 0.001;  // modified value for C/C++ code

  Numeric RECDVA = 1.00e0/DVA;

  int J      = (int) ((VI-V1A)*RECDVA + ONEPL) ;
  Numeric VJ = V1A + DVA * (Numeric)(J-1);
  Numeric P  = RECDVA * (VI-VJ);
  Numeric C  = (3.00e0-2.00e0*P) * P * P;
  Numeric B  = 0.500e0 * P * (1.00e0-P);
  Numeric B1 = B * (1.00e0-P);
  Numeric B2 = B * P;

  Numeric xint = -A[J-1] * B1             +
                  A[J]   * (1.00e0-C+B2)  +
                  A[J+1] * (C+B1)         -
                  A[J+2] * B2;

  /*
  cout << (J-1) << " <-> " << (J+2)
       << ",  V=" << VI << ", VJ=" << VJ << "\n";
  cout << "xint=" << xint  << " " << A[J-1] << " " << A[J] << " " << A[J+1] << " " << A[J+2] << "\n";
  */

  return xint;
}

// =================================================================================

Numeric RADFN_FUN (const Numeric VI,
       const Numeric XKT)
{
// ---------------------------------------------------------------------- B18060
//              LAST MODIFICATION:    12 AUGUST 1991                      B17940
//                                                                        B17950
//                 IMPLEMENTATION:    R.D. WORSHAM                        B17960
//                                                                        B17970
//            ALGORITHM REVISIONS:    S.A. CLOUGH                         B17980
//                                    R.D. WORSHAM                        B17990
//                                    J.L. MONCET                         B18000
//                                                                        B18010
//                                                                        B18020
//                    ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC.         B18030
//                    840 MEMORIAL DRIVE,  CAMBRIDGE, MA   02139          B18040
//                                                                        B18050
//                                                                        B18070
//              WORK SUPPORTED BY:    THE ARM PROGRAM                     B18080
//                                    OFFICE OF ENERGY RESEARCH           B18090
//                                    DEPARTMENT OF ENERGY                B18100
//                                                                        B18110
//                                                                        B18120
//     SOURCE OF ORIGINAL ROUTINE:    AFGL LINE-BY-LINE MODEL             B18130
//                                                                        B18140
//                                            FASCOD3                     B18150
//                                                                        B18160
// ---------------------------------------------------------------------- B18060
//                                                                        B18170
//  IN THE SMALL XVIOKT REGION 0.5 IS REQUIRED

  Numeric XVI   = VI;
  Numeric RADFN = 0.00e0;

  if (XKT > 0.0)
    {
      Numeric XVIOKT = XVI/XKT;

      if (XVIOKT <= 0.01e0)
  {
    RADFN = 0.500e0 * XVIOKT * XVI;
  }
      else if (XVIOKT <= 10.0e0)
  {
    Numeric EXPVKT = exp(-XVIOKT);
    RADFN = XVI * (1.00e0-EXPVKT) / (1.00e0+EXPVKT);
  }
      else
  {
    RADFN = XVI;
  }
    }
  else
    {
      RADFN = XVI;
    }

  return RADFN;
}

// =================================================================================


void CKD_222_self_h2o( MatrixView          pxsec,
           const Numeric       Cin,
           const String&       model,
           ConstVectorView     f_grid,
           ConstVectorView     abs_p,
           ConstVectorView     abs_t,
           ConstVectorView     vmr,
           ConstVectorView     abs_n2 _U_ )
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD222"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.2.2 H2O self continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD222\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the self H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt   = 2.686763e19; // [molecules/cm^3]
  // FIXME const Numeric T1       =  273.0e0;
  const Numeric TO       =  296.0e0;
  const Numeric PO       = 1013.0e0;

  // CKD2.2.2 specific self continuum correction function parameters
  const Numeric ALPHA2 = 200.000 * 200.000;
  const Numeric ALPHS2 = 120.000 * 120.000;
  const Numeric BETAS  = 5.000e-06;
  const Numeric V0S    = 1310.000;
  const Numeric FACTRS = 0.150;

  // These are self-continuum modification factors from 700-1200 cm-1
  const Numeric XFAC[51] = {
    1.00000,1.01792,1.03767,1.05749,1.07730,1.09708,
    1.10489,1.11268,1.12047,1.12822,1.13597,1.14367,
    1.15135,1.15904,1.16669,1.17431,1.18786,1.20134,
    1.21479,1.22821,1.24158,1.26580,1.28991,1.28295,
    1.27600,1.26896,1.25550,1.24213,1.22879,1.21560,
    1.20230,1.18162,1.16112,1.14063,1.12016,1.10195,
    1.09207,1.08622,1.08105,1.07765,1.07398,1.06620,
    1.05791,1.04905,1.03976,1.02981,1.00985,1.00000,
    1.00000,1.00000,1.00000};

  // wavenumber range where CKD H2O self continuum is valid
  const Numeric VABS_min = SL260_ckd_0_v1; // [cm^-1]
  const Numeric VABS_max = SL260_ckd_0_v2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD2.2.2 H2O self continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << SL296_ckd_0_v1 << "<->" << SL296_ckd_0_v2 << "cm^-1\n";
    }


  // ------------------- subroutine SL296/SL260 ----------------------------

  if (SL296_ckd_0_v1 != SL260_ckd_0_v1)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.2.2 H2O self continuum:\n"
   << "parameter V1 not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_0_v2 != SL260_ckd_0_v2)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.2.2 H2O self continuum:\n"
   << "parameter V2 not the same for different ref. temperatures.\n";
  throw runtime_error(os.str());
    }
  if (SL296_ckd_0_dv != SL260_ckd_0_dv)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.2.2 H2O self continuum:\n"
   << "parameter DV not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_0_npt != SL260_ckd_0_npt)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.2.2 H2O self continuum:\n"
   << "parameter NPT not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }

  // retrieve the appropriate array sequence of the self continuum
  // arrays of the CKD model.
  Numeric DVC = SL296_ckd_0_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-SL296_ckd_0_v1) / SL296_ckd_0_dv);
  if (V1C < SL296_ckd_0_v1) I1 = -1;
  V1C = SL296_ckd_0_v1 + (SL296_ckd_0_dv * (Numeric)I1);

  int I2 = (int) ((V2C-SL296_ckd_0_v1) / SL296_ckd_0_dv);

  int NPTC = I2-I1+3;
  if (NPTC > SL296_ckd_0_npt) NPTC = SL296_ckd_0_npt+1;

  V2C = V1C + SL296_ckd_0_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      ostringstream os;
      out3 << "WARNING:\n"
     << "  CKD2.2.2 H2O self continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric SH2OT0[NPTC+addF77fields]; // [cm^3/molecules]
  Numeric SH2OT1[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > SL296_ckd_0_npt) )
  {
    SH2OT0[J] = 0.0e0;   // at T=296 K
    SH2OT1[J] = 0.0e0;   // at T=260 K
  }
      else
  {
    SH2OT0[J] = SL296_ckd_0[I];    // at T=296 K
    SH2OT1[J] = SL260_ckd_0[I];    // at T=260 K
  }
    }

  // ------------------- subroutine SL296/SL260 ----------------------------

  Numeric SFAC = 1.00e0;
  Numeric VS2  = 0.00e0;
  // FIXME Numeric VS4  = 0.00e0;

  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {

      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                                     // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                          // [hPa]
      Numeric Patm   = Pave/PO;                                      // [1]
      Numeric vmrh2o = vmr[i];                                       // [1]
      // FIXME Numeric Ph2o   = Patm * vmrh2o;                                // [1]
      // second vmr in abs_coefCalc multiplied
      Numeric Rh2o   = Patm * (TO/Tave);                             // [1]
      Numeric Tfac   = (Tave-TO)/(260.0-TO);                         // [1]
      Numeric WTOT   = xLosmt * (Pave/1.013000e3) * (2.7300e2/Tave); // [molecules/cm^2]
      Numeric W1     = vmrh2o * WTOT;                                // [molecules/cm^2]
      Numeric XKT    = Tave / 1.4387752e0;                           // = (T*k_B)/(h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric SH2O = 0.0e0;
    if (SH2OT0[J] > 0.0e0)
      {
        SH2O = SH2OT0[J] * pow( (SH2OT1[J]/SH2OT0[J]), Tfac );
        SFAC = 1.00e0;

        if ( (VJ >= 700.0e0) && (VJ <= 1200.0e0) )
    {
      int JFAC = (int)((VJ - 700.0e0)/10.0e0 + 0.00001e0);
      if ( (JFAC >= 0) && (JFAC <= 50) )
        SFAC = XFAC[JFAC];
    }

        // ---------------------------------------------------------
        // Correction to self continuum (1 SEPT 85); factor of
        // 0.78 at 1000 and  .......

        VS2  = (VJ-V0S) * (VJ-V0S);

        SFAC = SFAC *
    ( 1.000e0 + 0.3000e0 * (1.000e4 / ((VJ*VJ)                         + 1.000e4))  ) *
    ( 1.000e0 - 0.2333e0 * (ALPHA2  / ((VJ-1050.000e0)*(VJ-1050.000e0) + ALPHA2))   ) *
    ( 1.000e0 - FACTRS   * (ALPHS2  / (VS2+(BETAS*VS2*VS2)+ALPHS2))                 );

        SH2O = SFAC * SH2O;
      }

    // CKD cross section with radiative field [1/cm]
    // the VMRH2O will be multiplied in abs_coefCalc, hence Rh2o does not contain
    // VMRH2O as multiplicative term
    k[J] = W1 * Rh2o * (SH2O*1.000e-20) * RADFN_FUN(VJ,XKT); // [1]

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V >= 0.000e0) && (V < SL296_ckd_0_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        // The factor 100 comes from the conversion from 1/cm to 1/m for
        // the absorption coefficient
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}



// =================================================================================


void CKD_222_foreign_h2o( MatrixView          pxsec,
        const Numeric       Cin,
        const String&       model,
        ConstVectorView     f_grid,
        ConstVectorView     abs_p,
        ConstVectorView     abs_t,
        ConstVectorView     vmr,
        ConstVectorView     abs_n2 _U_ )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD222"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.2.2 H2O foreign continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD222\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the foreign H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // [molecules/cm^3]
  const Numeric T1     =  273.000e0;
  const Numeric TO     =  296.000e0;
  const Numeric PO     = 1013.000e0;

  // CKD2.2.2 foreign H2O continuum correction function parameters
  const Numeric HWSQF  = 330.000e0 * 330.000e0;
  const Numeric BETAF  = 8.000e-11;
  const Numeric V0F    = 1130.000e0;
  const Numeric FACTRF = 0.970e0;

  const Numeric V0F2   = 1900.000e0;
  const Numeric HWSQF2 = 150.000e0 * 150.000e0;
  const Numeric BETA2  = 3.000e-6;

  // wavenumber range where CKD H2O foreign continuum is valid
  const Numeric VABS_min = FH2O_ckd_0_v1; // [cm^-1]
  const Numeric VABS_max = FH2O_ckd_0_v2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD2.2.2 H2O foreign continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << FH2O_ckd_0_v1 << "<->" << FH2O_ckd_0_v2 << "cm^-1\n";
    }


  // ---------------------- subroutine FRN296 ------------------------------

  // retrieve the appropriate array sequence of the foreign continuum
  // arrays of the CKD model.
  Numeric DVC = FH2O_ckd_0_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-FH2O_ckd_0_v1) / FH2O_ckd_0_dv);
  if (V1C < FH2O_ckd_0_v1) I1 = -1;
  V1C = FH2O_ckd_0_v1 + (FH2O_ckd_0_dv * (Numeric)I1);

  int I2 = (int) ((V2C-FH2O_ckd_0_v1) / FH2O_ckd_0_dv);

  int NPTC = I2-I1+3;
  if (NPTC > FH2O_ckd_0_npt) NPTC = FH2O_ckd_0_npt+1;

  V2C = V1C + FH2O_ckd_0_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD2.2.2 H2O foreign continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric FH2OT0[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > FH2O_ckd_0_npt) )
  {
    FH2OT0[J] = 0.0e0;
  }
      else
  {
    FH2OT0[J] = FH2O_ckd_0[I];
  }
    }

  // ---------------------- subroutine FRN296 ------------------------------

  Numeric VF2   = 0.000e0;
  Numeric VF4   = 0.000e0;
  Numeric VF6   = 0.000e0;
  Numeric FSCAL = 0.000e0;
  Numeric FH2O  = 0.000e0;

  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {

      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmrh2o = vmr[i];                                 // [1]
      // FIXME Numeric ph2o   = vmrh2o * Pave;                          // [hPa]
      Numeric PFRGN  = (Pave/PO) * (1.00000e0 - vmrh2o);       // dry air pressure [hPa]
      Numeric RFRGN  = PFRGN  * (TO/Tave);                     // [hPa]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      // FIXME Numeric W1     = vmrh2o * WTOT;                          // [molecules/cm^2]
      Numeric XKT    = Tave   / 1.4387752;                     // = (T*k_B) / (h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ = V1C + (DVC * (Numeric)(J-1));

    // CORRECTION TO FOREIGN CONTINUUM
    VF2   = (VJ-V0F)  * (VJ-V0F);
    VF6   = VF2 * VF2 * VF2;
    FSCAL = (1.000e0 - FACTRF*(HWSQF/(VF2+(BETAF*VF6)+HWSQF)));

    VF2   = (VJ-V0F2) * (VJ-V0F2);
    VF4   = VF2 * VF2;
    FSCAL = FSCAL * (1.000e0 - 0.600e0*(HWSQF2/(VF2 + BETA2*VF4 + HWSQF2)));

    FH2O  = FH2OT0[J] * FSCAL;

    // CKD cross section with radiative field [1/cm]
    // The VMRH2O will be multiplied in abs_coefCalc, hence WTOT and not W1
    // as multiplicative term
    k[J] = WTOT * RFRGN * (FH2O*1.000e-20) * RADFN_FUN(VJ,XKT);

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > 0.000e0) && (V < VABS_max) )
      {
        // arts CKD2.2.2 foreign H2O continuum cross section [1/m]
        // interpolate the k vector on the f_grid grid
        // The factor 100 comes from the conversion from (1/cm) to (1/m)
        // of the abs. coeff.
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}


// =================================================================================


void CKD_242_self_h2o( MatrixView          pxsec,
           const Numeric       Cin,
           const String&       model,
           ConstVectorView     f_grid,
           ConstVectorView     abs_p,
           ConstVectorView     abs_t,
           ConstVectorView     vmr,
           ConstVectorView     abs_n2 _U_ )
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD242"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.4.2 H2O self continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD242\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the self H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt   = 2.686763e19; // [molecules/cm^3]
  // FIXME const Numeric T1       =  273.0e0;
  const Numeric TO       =  296.0e0;
  const Numeric PO       = 1013.0e0;

  // CKD2.4.2 specific correction functions
  const Numeric V0S1     = 0.000e+00;
  const Numeric HWSQ1    = (1.000e+02 * 1.000e+02);
  const Numeric BETAS1   = 1.000e-04;
  const Numeric FACTRS1  = 0.688e+00;

  const Numeric V0S2     = 1.050e+03;
  const Numeric HWSQ2    = (2.000e+02 * 2.000e+02);
  const Numeric FACTRS2  = -0.2333e+00;

  const Numeric V0S3     = 1.310e+03;
  const Numeric HWSQ3    = (1.200e+02 * 1.200e+02);
  const Numeric BETAS3   = 5.000e-06;
  const Numeric FACTRS3  = -0.150e+00;

  const Numeric XFAC[51] = {
    1.00000,1.01792,1.03767,1.05749,1.07730,1.09708,
    1.10489,1.11268,1.12047,1.12822,1.13597,1.14367,
    1.15135,1.15904,1.16669,1.17431,1.18786,1.20134,
    1.21479,1.22821,1.24158,1.26580,1.28991,1.28295,
    1.27600,1.26896,1.25550,1.24213,1.22879,1.21560,
    1.20230,1.18162,1.16112,1.14063,1.12016,1.10195,
    1.09207,1.08622,1.08105,1.07765,1.07398,1.06620,
    1.05791,1.04905,1.03976,1.02981,1.00985,1.00000,
    1.00000,1.00000,1.00000};

  // wavenumber range where CKD H2O self continuum is valid
  const Numeric VABS_min = SL260_ckd_0_v1; // [cm^-1]
  const Numeric VABS_max = SL260_ckd_0_v2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD2.4.2 H2O self continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << SL296_ckd_0_v1 << "<->" << SL296_ckd_0_v2 << "cm^-1\n";
    }


  // ------------------- subroutine SL296/SL260 ----------------------------

  if (SL296_ckd_0_v1 != SL260_ckd_0_v1)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.4.2 H2O self continuum:\n"
   << "parameter V1 not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_0_v2 != SL260_ckd_0_v2)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.4.2 H2O self continuum:\n"
   << "parameter V2 not the same for different ref. temperatures.\n";
  throw runtime_error(os.str());
    }
  if (SL296_ckd_0_dv != SL260_ckd_0_dv)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.4.2 H2O self continuum:\n"
   << "parameter DV not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_0_npt != SL260_ckd_0_npt)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD2.4.2 H2O self continuum:\n"
   << "parameter NPT not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }

  // retrieve the appropriate array sequence of the self continuum
  // arrays of the CKD model.
  Numeric DVC = SL296_ckd_0_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-SL296_ckd_0_v1) / SL296_ckd_0_dv);
  if (V1C < SL296_ckd_0_v1) I1 = -1;
  V1C = SL296_ckd_0_v1 + (SL296_ckd_0_dv * (Numeric)I1);

  int I2 = (int) ((V2C-SL296_ckd_0_v1) / SL296_ckd_0_dv);

  int NPTC = I2-I1+3;
  if (NPTC > SL296_ckd_0_npt) NPTC = SL296_ckd_0_npt+1;

  V2C = V1C + SL296_ckd_0_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      ostringstream os;
      out3 << "WARNING:\n"
     << "  CKDv2.4.2 H2O self continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric SH2OT0[NPTC+addF77fields]; // [cm^3/molecules]
  Numeric SH2OT1[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > SL296_ckd_0_npt) )
  {
    SH2OT0[J] = 0.0e0;   // at T=296 K
    SH2OT1[J] = 0.0e0;   // at T=260 K
  }
      else
  {
    SH2OT0[J] = SL296_ckd_0[I];    // at T=296 K
    SH2OT1[J] = SL260_ckd_0[I];    // at T=260 K
  }
    }

  // ------------------- subroutine SL296/SL260 ----------------------------

  Numeric SFAC = 1.00e0;
  Numeric VS2  = 0.00e0;
  Numeric VS4  = 0.00e0;

  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {

      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                                     // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                          // [hPa]
      Numeric Patm   = Pave/PO;                                      // [1]
      Numeric vmrh2o = vmr[i];                                       // [1]
      // FIXME Numeric Ph2o   = Patm * vmrh2o;                                // [1]
      // second vmr in abs_coefCalc multiplied
      Numeric Rh2o   = Patm * (TO/Tave);                             // [1]
      Numeric Tfac   = (Tave-TO)/(260.0-TO);                         // [1]
      Numeric WTOT   = xLosmt * (Pave/1.013000e3) * (2.7300e2/Tave); // [molecules/cm^2]
      Numeric W1     = vmrh2o * WTOT;                                // [molecules/cm^2]
      Numeric XKT    = Tave / 1.4387752e0;                           // = (T*k_B)/(h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric SH2O = 0.0e0;
    if (SH2OT0[J] > 0.0e0)
      {
        SH2O = SH2OT0[J] * pow( (SH2OT1[J]/SH2OT0[J]), Tfac );
        SFAC = 1.00e0;

        if ( (VJ >= 700.0e0) && (VJ <= 1200.0e0) )
    {
      int JFAC = (int)((VJ - 700.0e0)/10.0e0 + 0.00001e0);
      if ( (JFAC >= 0) && (JFAC <= 50) )
        SFAC = XFAC[JFAC];
    }

        // ---------------------------------------------------------
        // Correction to self continuum (1 SEPT 85); factor of
        // 0.78 at 1000 and  .......

        VS2  = (VJ-V0S1) * (VJ-V0S1);
        VS4  = VS2*VS2;
        SFAC = SFAC *
    (1.000e0 + FACTRS1*(HWSQ1/((VJ*VJ)+(BETAS1*VS4)+HWSQ1)));

        VS2  = (VJ-V0S2) * (VJ-V0S2);
        SFAC = SFAC *
    (1.000e0 + FACTRS2*(HWSQ2/(VS2+HWSQ2)));

        VS2  = (VJ-V0S3) * (VJ-V0S3);
        VS4  = VS2*VS2;
        SFAC = SFAC *
    (1.000e0 + FACTRS3*(HWSQ3/(VS2+(BETAS3*VS4)+HWSQ3)));

        SH2O = SFAC * SH2O;
      }

    // CKD cross section with radiative field [1/cm]
    // The VMRH2O will be multiplied in abs_coefCalc, hence Rh2o does not contain
    // VMRH2O as multiplicative term
    k[J] = W1 * Rh2o * (SH2O*1.000e-20) * RADFN_FUN(VJ,XKT);

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V >= 0.000e0) && (V < SL296_ckd_0_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        // The factor 100 comes from the conversion from 1/cm to 1/m for
        // the absorption coefficient
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}


// =================================================================================


void CKD_242_foreign_h2o( MatrixView          pxsec,
        const Numeric       Cin,
        const String&       model,
        ConstVectorView     f_grid,
        ConstVectorView     abs_p,
        ConstVectorView     abs_t,
        ConstVectorView     vmr,
        ConstVectorView     abs_n2 _U_ )
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD242"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.4.2 H2O foreign continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD242\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the foreign H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;

  // CKD2.4.2 foreign H2O continuum correction function parameters
  const Numeric V0F1     = 350.000e0;
  const Numeric HWSQF1   = 200.000e0 * 200.000e0;
  const Numeric BETAF1   = 5.000e-9 ;
  const Numeric FACTRF1  = -0.700e0;

  const Numeric V0F1a    = 630.000e0;
  const Numeric HWSQF1a  = 65.000e0*65.000e0;
  const Numeric BETAF1a  = 2.000e-08 ;
  const Numeric FACTRF1a = 0.750e0;

  const Numeric V0F2     = 1130.000e0;
  const Numeric HWSQF2   = 330.000e0 * 330.000e0;
  const Numeric BETAF2   = 8.000e-11;
  const Numeric FACTRF2  = -0.970e0;

  const Numeric V0F3     = 1975.000e0;
  const Numeric HWSQF3   = 250.000e0 * 250.000e0;
  const Numeric BETAF3   = 5.000e-06;
  const Numeric FACTRF3  = -0.650e0;

  // wavenumber range where CKD H2O foreign continuum is valid
  const Numeric VABS_min = FH2O_ckd_0_v1; // [cm^-1]
  const Numeric VABS_max = FH2O_ckd_0_v2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKDv2.4.2 H2O foreign continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << FH2O_ckd_0_v1 << "<->" << FH2O_ckd_0_v2 << "cm^-1\n";
    }


  // ---------------------- subroutine FRN296 ------------------------------

  // retrieve the appropriate array sequence of the foreign continuum
  // arrays of the CKD model.
  Numeric DVC = FH2O_ckd_0_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-FH2O_ckd_0_v1) / FH2O_ckd_0_dv);
  if (V1C < FH2O_ckd_0_v1) I1 = -1;
  V1C = FH2O_ckd_0_v1 + (FH2O_ckd_0_dv * (Numeric)I1);

  int I2 = (int) ((V2C-FH2O_ckd_0_v1) / FH2O_ckd_0_dv);

  int NPTC = I2-I1+3;
  if (NPTC > FH2O_ckd_0_npt) NPTC = FH2O_ckd_0_npt+1;

  V2C = V1C + FH2O_ckd_0_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKDv2.4.2 H2O foreign continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric FH2OT0[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > FH2O_ckd_0_npt) )
  {
    FH2OT0[J] = 0.0e0;
  }
      else
  {
    FH2OT0[J] = FH2O_ckd_0[I];
  }
    }

  // ---------------------- subroutine FRN296 ------------------------------

  Numeric VF2   = 0.000e0;
  Numeric VF4   = 0.000e0;
  Numeric VF6   = 0.000e0;
  Numeric FSCAL = 0.000e0;
  Numeric FH2O  = 0.000e0;

  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {

      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmrh2o = vmr[i];                                 // [1]
      // FIXME Numeric ph2o   = vmrh2o * Pave;                          // [hPa]
      Numeric PFRGN  = (Pave/PO) * (1.00000e0 - vmrh2o);       // dry air pressure [hPa]
      Numeric RFRGN  = PFRGN  * (TO/Tave);                     // [hPa]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      // FIXME Numeric W1     = vmrh2o * WTOT;                          // [molecules/cm^2]
      Numeric XKT    = Tave   / 1.4387752;                     // = (T*k_B) / (h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ = V1C + (DVC * (Numeric)(J-1));

    // CORRECTION TO FOREIGN CONTINUUM
    VF2   = (VJ-V0F1) * (VJ-V0F1);
    VF6   = VF2 * VF2 * VF2;
    FSCAL = (1.000e0 + FACTRF1*(HWSQF1/(VF2+(BETAF1*VF6)+HWSQF1)));

    VF2   = (VJ-V0F1a) * (VJ-V0F1a);
    VF6   = VF2 * VF2  * VF2;
    FSCAL = FSCAL *
            (1.000e0 + FACTRF1a*(HWSQF1a/(VF2+(BETAF1a*VF6)+HWSQF1a)));

    VF2   = (VJ-V0F2) * (VJ-V0F2);
    VF6   = VF2 * VF2 * VF2;
    FSCAL = FSCAL *
            (1.000e0 + FACTRF2*(HWSQF2/(VF2+(BETAF2*VF6)+HWSQF2)));

    VF2   = (VJ-V0F3) * (VJ-V0F3);
    VF4   = VF2 * VF2;
    FSCAL = FSCAL *
      (1.000e0 + FACTRF3*(HWSQF3/(VF2+BETAF3*VF4+HWSQF3)));

    FH2O  = FH2OT0[J] * FSCAL;

    // CKD cross section without radiative field
    // The VMRH2O will be multiplied in abs_coefCalc, hence WTOT and not W1
    // as multiplicative term
    k[J] = WTOT * RFRGN * (FH2O*1.000e-20) * RADFN_FUN(VJ,XKT);

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V >= 0.000e0) && (V < VABS_max) )
      {
        // arts CKD2.4.2 foreign H2O continuum cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}


// =================================================================================


void CKD_mt_100_self_h2o( MatrixView          pxsec,
        const Numeric       Cin,
        const String&       model,
        ConstVectorView     f_grid,
        ConstVectorView     abs_p,
        ConstVectorView     abs_t,
        ConstVectorView     vmr,
        ConstVectorView     abs_n2 _U_ )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 H2O self continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the self H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt =    2.68675e19; // [molecules/cm^3]
  // FIXME const Numeric T1     =  273.000e0;    // [K]
  const Numeric TO     =  296.000e0;    // [K]
  const Numeric PO     = 1013.000e0;    // [hPa]

  const Numeric XFACREV[15] =
    {1.003, 1.009, 1.015, 1.023, 1.029,1.033,
     1.037, 1.039, 1.040, 1.046, 1.036,1.027,
     1.01,  1.002, 1.00};

  // wavenumber range where CKD H2O self continuum is valid
  const Numeric VABS_min = -2.000e1; // [cm^-1]
  const Numeric VABS_max =  2.000e4; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD_MT 1.00 H2O self continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << SL296_ckd_mt_100_v1 << "<->" << SL296_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine SL296/SL260 ----------------------------

  if (SL296_ckd_mt_100_v1 != SL260_ckd_mt_100_v1)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 H2O self continuum:\n"
   << "parameter V1 not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_mt_100_v2 != SL260_ckd_mt_100_v2)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 H2O self continuum:\n"
   << "parameter V2 not the same for different ref. temperatures.\n";
  throw runtime_error(os.str());
    }
  if (SL296_ckd_mt_100_dv != SL260_ckd_mt_100_dv)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 H2O self continuum:\n"
   << "parameter DV not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (SL296_ckd_mt_100_npt != SL260_ckd_mt_100_npt)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 H2O self continuum:\n"
   << "parameter NPT not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }

  // retrieve the appropriate array sequence of the self continuum
  // arrays of the CKD model.
  Numeric DVC = SL296_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-SL296_ckd_mt_100_v1) / SL296_ckd_mt_100_dv);
  if (V1C < SL296_ckd_mt_100_v1) I1 = -1;
  V1C = SL296_ckd_mt_100_v1 + (SL296_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-SL296_ckd_mt_100_v1) / SL296_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > SL296_ckd_mt_100_npt) NPTC = SL296_ckd_mt_100_npt+1;

  V2C = V1C + SL296_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      ostringstream os;
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 H2O self continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric SH2OT0[NPTC+addF77fields]; // [cm^3/molecules]
  Numeric SH2OT1[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > SL296_ckd_mt_100_npt) )
  {
    SH2OT0[J] = 0.0e0;   // at T=296 K
    SH2OT1[J] = 0.0e0;   // at T=260 K
  }
      else
  {
    SH2OT0[J] = SL296_ckd_mt_100[I];    // at T=296 K
    SH2OT1[J] = SL260_ckd_mt_100[I];    // at T=260 K
  }
    }

  // ------------------- subroutine SL296/SL260 ----------------------------

  Numeric SFAC = 1.00e0;

  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {

      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                                     // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                          // [hPa]
      Numeric Patm   = Pave/PO;                                      // [1]
      Numeric vmrh2o = vmr[i];                                       // [1]
      // FIXME Numeric Ph2o   = Patm * vmrh2o;                                // [1]
      // second vmr in abs_coefCalc multiplied
      Numeric Rh2o   = Patm * (TO/Tave);                             // [1]
      Numeric Tfac   = (Tave-TO)/(260.0-TO);                         // [1]
      Numeric WTOT   = xLosmt * (Pave/1.013000e3) * (2.7300e2/Tave); // [molecules/cm^2]
      Numeric W1     = vmrh2o * WTOT;                                // [molecules/cm^2]
      Numeric XKT    = Tave / 1.4387752e0;                           // = (T*k_B)/(h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric SH2O = 0.0e0;
    if (SH2OT0[J] > 0.0e0)
      {
        SH2O = SH2OT0[J] * pow( (SH2OT1[J]/SH2OT0[J]), Tfac );
        SFAC = 1.00e0;

        if ( (VJ >= 820.0e0) && (VJ <= 960.0e0) )
    {
      int JFAC = (int)((VJ - 820.0e0)/10.0e0 + 0.00001e0);
      if ( (JFAC >= 0) && (JFAC <=14) )
        SFAC = XFACREV[JFAC];
    }

        SH2O = SFAC * SH2O;
      }

    // CKD cross section with radiative field [1/cm]
    // The VMRH2O will be multiplied in abs_coefCalc, hence Rh2o does not contain
    // VMRH2O as multiplicative term
    k[J] = W1 * Rh2o * (SH2O*1.000e-20) * RADFN_FUN(VJ,XKT);

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > 0.000e0) && (V < SL296_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        // The factor 100 comes from the conversion from 1/cm to 1/m for
        // the absorption coefficient
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// =================================================================================


void CKD_mt_100_foreign_h2o( MatrixView          pxsec,
           const Numeric       Cin,
           const String&       model,
           ConstVectorView     f_grid,
           ConstVectorView     abs_p,
           ConstVectorView     abs_t,
           ConstVectorView     vmr,
           ConstVectorView     abs_n2 _U_ )
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 H2O foreign continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the foreign H2O cont. absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.68675e19; // [molecules/cm^3]
  const Numeric T1     =  273.000e0;
  const Numeric TO     =  296.000e0;
  const Numeric PO     = 1013.000e0;

  // wavenumber range where CKD H2O self continuum is valid
  const Numeric VABS_min = -2.000e1; // [cm^-1]
  const Numeric VABS_max =  2.000e4; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD_MT 1.00 H2O foreign continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << FH2O_ckd_mt_100_v1 << "<->" << FH2O_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ---------------------- subroutine FRN296 ------------------------------

  // retrieve the appropriate array sequence of the foreign continuum
  // arrays of the CKD model.
  Numeric DVC = FH2O_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-FH2O_ckd_mt_100_v1) / FH2O_ckd_mt_100_dv);
  if (V1C < FH2O_ckd_mt_100_v1) I1 = -1;
  V1C = FH2O_ckd_mt_100_v1 + (FH2O_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-FH2O_ckd_mt_100_v1) / FH2O_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > FH2O_ckd_mt_100_npt) NPTC = FH2O_ckd_mt_100_npt+1;

  V2C = V1C + FH2O_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 H2O foreign continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric FH2OT0[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > FH2O_ckd_mt_100_npt) )
  {
    FH2OT0[J] = 0.0e0;
  }
      else
  {
    FH2OT0[J] = FH2O_ckd_mt_100[I];
  }
    }

  // ---------------------- subroutine FRN296 ------------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      // atmospheric state parameters
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmrh2o = vmr[i];                                 // [1]
      // FIXME Numeric ph2o   = vmrh2o * Pave;                          // [hPa]
      Numeric PFRGN  = (Pave/PO) * (1.00000e0 - vmrh2o);       // dry air pressure [hPa]
      Numeric RFRGN  = PFRGN  * (TO/Tave);                     // [hPa]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      // FIXME Numeric W1     = vmrh2o * WTOT;                          // [molecules/cm^2]
      Numeric XKT    = Tave   / 1.4387752;                     // = (T*k_B) / (h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric FH2O = FH2OT0[J];

    // CKD cross section with radiative field [1/cm]
    // The VMRH2O will be multiplied in abs_coefCalc, hence WTOT and not W1
    // as multiplicative term
    k[J] = WTOT * RFRGN * (FH2O*1.000e-20) * RADFN_FUN(VJ,XKT);

  }

      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V >= 0.000e0) && (V < VABS_max) )
      {
        // arts CKD_MT.100 cross section [1/m]
        // interpolate the k vector on the f_grid grid
        // The factor 100 comes from the conversion from (1/cm) to (1/m)
        // of the abs. coeff.
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

//

// =================================================================================


void CKD_241_co2( MatrixView         pxsec,
     const Numeric       Cin,
     const String&       model,
     ConstVectorView     f_grid,
     ConstVectorView     abs_p,
     ConstVectorView     abs_t _U_,
     ConstVectorView     vmr _U_)
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD241"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.4.1 CO2 continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD241\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the CO2 absorption
  Numeric  ScalingFac = 0.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }
  else
    {
      ScalingFac = 1.0000e0;
    }

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;

  // wavenumber range where CKD CO2 continuum is valid
  const Numeric VABS_min = -2.000e1; // [cm^-1]
  const Numeric VABS_max =  1.000e4; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKDv2.4.1 CO2 continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << FCO2_ckd_mt_100_v1 << "<->" << FCO2_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ---------------------- subroutine FRNCO2 ------------------------------

  // retrieve the appropriate array sequence of the CO2 continuum
  // arrays of the CKD model.
  Numeric DVC = FCO2_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-FCO2_ckd_mt_100_v1) / FCO2_ckd_mt_100_dv);
  if (V1C < FCO2_ckd_mt_100_v1) I1 = -1;
  V1C = FCO2_ckd_mt_100_v1 + (FCO2_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-FCO2_ckd_mt_100_v1) / FCO2_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > FCO2_ckd_mt_100_npt) NPTC = FCO2_ckd_mt_100_npt+1;

  V2C = V1C + FCO2_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKDv2.4.1 CO2 continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric FCO2T0[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > FCO2_ckd_mt_100_npt) )
  {
    FCO2T0[J] = 0.0e0;
  }
      else
  {
    FCO2T0[J] = FCO2_ckd_mt_100[I];
  }
    }

  // ---------------------- subroutine FRNCO2 ------------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      // FIXME Numeric vmrco2 = vmr[i];                                 // [1]
      Numeric Rhoave = (Pave/PO) * (TO/Tave);                  // [hPa]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      Numeric XKT    = Tave / 1.4387752;                       // = (T*k_B) / (h*c)


      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric FCO2 = FCO2T0[J];

    // CKD cross section times number density with radiative field [1]
    // the VMRCO2 will be multiplied in abs_coefCalc
    k[J] = ((WTOT * Rhoave) * (FCO2*1.000e-20) * RADFN_FUN(VJ,XKT));

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > 0.000e0) && (V < FCO2_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}


// =================================================================================



void CKD_mt_co2( MatrixView          pxsec,
     const Numeric       Cin,
     const String&       model,
     ConstVectorView     f_grid,
     ConstVectorView     abs_p,
     ConstVectorView     abs_t,
     ConstVectorView     vmr _U_)
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT.1.00 CO2 continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the CO2 absorption
  Numeric  ScalingFac = 0.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }
  else
    {
      ScalingFac = 1.0000e0;
    }

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;

  // wavenumber range where CKD CO2 continuum is valid
  const Numeric VABS_min = FCO2_ckd_mt_100_v1; // [cm^-1]
  const Numeric VABS_max = FCO2_ckd_mt_100_v2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD_MT 1.00 CO2 continuum:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << FCO2_ckd_mt_100_v1 << "<->" << FCO2_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ---------------------- subroutine FRNCO2 ------------------------------

  // retrieve the appropriate array sequence of the CO2 continuum
  // arrays of the CKD model.
  Numeric DVC = FCO2_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-FCO2_ckd_mt_100_v1) / FCO2_ckd_mt_100_dv);
  if (V1C < FCO2_ckd_mt_100_v1) I1 = -1;
  V1C = FCO2_ckd_mt_100_v1 + (FCO2_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-FCO2_ckd_mt_100_v1) / FCO2_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > FCO2_ckd_mt_100_npt) NPTC = FCO2_ckd_mt_100_npt+1;

  V2C = V1C + FCO2_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 CO2 continuum:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.";
      return;
    }

  Numeric FCO2T0[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > FCO2_ckd_mt_100_npt) )
  {
    FCO2T0[J] = 0.0e0;
  }
      else
  {
    FCO2T0[J] = FCO2_ckd_mt_100[I];
  }
    }

  // ---------------------- subroutine FRNCO2 ------------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      // FIXME Numeric vmrco2 = vmr[i];                                 // [1]
      Numeric Rhoave = (Pave/PO) * (TO/Tave);                  // [hPa]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      Numeric XKT    = Tave / 1.4387752;                       // = (T*k_B) / (h*c)


      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ   = V1C + (DVC * (Numeric)(J-1));
    Numeric FCO2 = FCO2T0[J];

    // continuum has been increased in the nu2 band by a factor of 7
    if ( (VJ > 500.0e0) && (VJ < 900.0e0) )
      {
        FCO2 = 7.000e0 * FCO2;
      }

    // CKD cross section times number density with radiative field [1]
    // the VMRCO2 will be multiplied in abs_coefCalc
    k[J] = ((WTOT * Rhoave) * (FCO2*1.000e-20) * RADFN_FUN(VJ,XKT));

  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > 0.000e0) && (V < FCO2_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}


// =================================================================================

void CKD_mt_CIArot_n2( MatrixView         pxsec,
          const Numeric       Cin,
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     vmr )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 N2 CIA rotational band:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the N2-N2 CIA rot. band absorption
  Numeric  ScalingFac = 0.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }
  else
    {
      ScalingFac = 1.0000e0;
    }

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  // FIXME const Numeric xLosmt = 2.686763e19; // Loschmidt Number [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;


  // wavenumber range where CKD H2O self continuum is valid
  const Numeric VABS_min = -1.000e1; // [cm^-1]
  const Numeric VABS_max =  3.500e2; // [cm^-1]


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < VABS_min) || (V1ABS > VABS_max) ||
       (V2ABS < VABS_min) || (V2ABS > VABS_max) )
    {
      out3  << "WARNING:\n"
            << "  CKD_MT 1.00 N2-N2 CIA rotational band:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << N2N2_CT296_ckd_mt_100_v1 << "<->" << N2N2_CT220_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine N2R296/N2R220 ----------------------------

  if (N2N2_CT296_ckd_mt_100_v1 != N2N2_CT220_ckd_mt_100_v1)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 N2-N2 CIA rotational band:\n"
   << "parameter V1 not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (N2N2_CT296_ckd_mt_100_v2 != N2N2_CT220_ckd_mt_100_v2)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 N2-N2 CIA rotational band:\n"
   << "parameter V2 not the same for different ref. temperatures.\n";
  throw runtime_error(os.str());
    }
  if (N2N2_CT296_ckd_mt_100_dv != N2N2_CT220_ckd_mt_100_dv)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 N2-N2 CIA rotational band:\n"
   << "parameter DV not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }
  if (N2N2_CT296_ckd_mt_100_npt != N2N2_CT220_ckd_mt_100_npt)
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT 1.00 N2-N2 CIA rotational band:\n"
   << "parameter NPT not the same for different ref. temperatures.\n";
      throw runtime_error(os.str());
    }

  // retrieve the appropriate array sequence of the self continuum
  // arrays of the CKD model.
  Numeric DVC = N2N2_CT296_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-N2N2_CT296_ckd_mt_100_v1) / N2N2_CT296_ckd_mt_100_dv);
  if (V1C < N2N2_CT296_ckd_mt_100_v1) I1 = -1;
  V1C    = N2N2_CT296_ckd_mt_100_v1 + (N2N2_CT296_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-N2N2_CT296_ckd_mt_100_v1) / N2N2_CT296_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > N2N2_CT296_ckd_mt_100_npt) NPTC = N2N2_CT296_ckd_mt_100_npt+1;

  V2C    = V1C + N2N2_CT296_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 N2-N2 CIA rotational band:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.\n";
      return;
    }

  Numeric C0[NPTC+addF77fields]; // [cm^3/molecules]
  Numeric C1[NPTC+addF77fields]; // [cm^3/molecules]

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      Index I = I1+J;
      if ( (I < 1) || (I > N2N2_CT296_ckd_mt_100_npt) )
  {
    C0[J] = 0.0e0;   // at T=296 K
    C1[J] = 0.0e0;   // at T=260 K
  }
      else
  {
    C0[J] = N2N2_CT296_ckd_mt_100[I];    // at T=296 K
    C1[J] = N2N2_CT220_ckd_mt_100[I];    // at T=260 K
  }
    }

  // ------------------- subroutine N2R296/N2R220 ----------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmrn2  = vmr[i];                                 // [1]
      Numeric facfac = vmrn2 * (Pave/PO) * (Pave/PO) *
                               (T1/Tave) * (T1/Tave);

      Numeric XKT    = Tave / 1.4387752;                       // = (T*k_B) / (h*c)
      Numeric Tfac   = (Tave - TO) / (220.0e0 - TO);

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    k[J] = 0.000e0;
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    Numeric SN2 = 0.000e0;
    if ( (C0[J] > 0.000e0) && (C1[J] > 0.000e0) )
      {
        SN2 = facfac* C0[J] * pow( (C1[J]/C0[J]), Tfac );
      }

    // CKD cross section with radiative field
    k[J] = SN2 * RADFN_FUN(VJ,XKT); // [1]
  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > 0.000e0) && (V < N2N2_CT220_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// =================================================================================


void CKD_mt_CIAfun_n2( MatrixView         pxsec,
          const Numeric       Cin,
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     vmr )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 N2 CIA fundamental band:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the N2-N2 CIA fundamental band absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // Loschmidt Number [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;
  const Numeric a1     = 0.8387e0;
  const Numeric a2     = 0.0754e0;


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < N2N2_N2F_ckd_mt_100_v1) || (V1ABS > N2N2_N2F_ckd_mt_100_v2) ||
       (V2ABS < N2N2_N2F_ckd_mt_100_v1) || (V2ABS > N2N2_N2F_ckd_mt_100_v2) )
    {
      out3  << "WARNING:\n"
            << "   CKD_MT 1.00 N2-N2 CIA fundamental band:\n"
      << "   input frequency vector exceeds range of model validity\n"
      << "  " << N2N2_N2F_ckd_mt_100_v1 << "<->" << N2N2_N2F_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine N2_VER_1 ----------------------------

  // retrieve the appropriate array sequence of the self continuum
  // arrays of the CKD model.
  Numeric DVC = N2N2_N2F_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-N2N2_N2F_ckd_mt_100_v1) / N2N2_N2F_ckd_mt_100_dv);
  if (V1C < N2N2_N2F_ckd_mt_100_v1) I1 = -1;
  V1C    = N2N2_N2F_ckd_mt_100_v1 + (N2N2_N2F_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-N2N2_N2F_ckd_mt_100_v1) / N2N2_N2F_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > N2N2_N2F_ckd_mt_100_npt) NPTC = N2N2_N2F_ckd_mt_100_npt+1;

  V2C    = V1C + N2N2_N2F_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 N2-N2 CIA fundamental band:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n";
      return;
    }

  Numeric xn2[NPTC+addF77fields];
  Numeric xn2t[NPTC+addF77fields];

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      xn2[J]  = 0.000e0;
      xn2t[J] = 0.000e0;
      Index I = I1+J;
      if ( (I > 0) && (I <= N2N2_N2F_ckd_mt_100_npt) )
  {
    xn2[J]  = N2N2_N2F_ckd_mt_100[I];
    xn2t[J] = N2N2_N2Ft_ckd_mt_100[I];
  }
    }

  // ------------------- subroutine N2_VER_1 ----------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmrn2  = vmr[i];                                 // [1]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      Numeric tau_fac= WTOT   * (Pave/PO) * (T1/Tave);

      Numeric XKT    = Tave / 1.4387752e0;                     // = (T*k_B) / (h*c)

      // FIXME Numeric Tfac   = (Tave - TO) / (220.0e0 - TO);           // [1]
      Numeric xktfac = (1.000e0/TO) - (1.000e0/Tave);          // [1/K]
      Numeric factor = 0.000e0;
      if (vmrn2 > VMRCalcLimit)
  {
    factor = (1.000e0 / xLosmt) * (1.000e0/vmrn2) * (a1 - a2*(Tave/TO));
  }

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.000e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    k[J] = 0.000e0;
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    Numeric SN2 = 0.000e0;
    if (xn2[J] > 0.000e0)
      {
        Numeric C0 = factor * xn2[J] * exp(xn2t[J]*xktfac) / VJ;
        SN2 = tau_fac * C0;
      }

    // CKD cross section with radiative field
    k[J] = SN2 * RADFN_FUN(VJ,XKT); // [1/cm]
  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > N2N2_N2F_ckd_mt_100_v1) && (V < N2N2_N2F_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// =================================================================================


void CKD_mt_CIAfun_o2( MatrixView         pxsec,
          const Numeric       Cin,
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     vmr _U_ )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 O2 CIA fundamental band:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the O2-O2 CIA fundamental band absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt = 2.686763e19; // Loschmidt Number [molecules/cm^3]
  const Numeric T1     =  273.0e0;
  const Numeric TO     =  296.0e0;
  const Numeric PO     = 1013.0e0;


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < O2O2_O2F_ckd_mt_100_v1) || (V1ABS > O2O2_O2F_ckd_mt_100_v2) ||
       (V2ABS < O2O2_O2F_ckd_mt_100_v1) || (V2ABS > O2O2_O2F_ckd_mt_100_v2) )
    {
      out3  << "WARNING:\n"
            << "  CKD_MT 1.00 O2-O2 CIA fundamental band:\n"
      << "  input frequency vector exceeds range of model validity\n"
      << "  " << O2O2_O2F_ckd_mt_100_v1 << "<->" << O2O2_O2F_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine O2_VER_1 ----------------------------

  // retrieve the appropriate array sequence of the CKD model array.
  Numeric DVC = O2O2_O2F_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-O2O2_O2F_ckd_mt_100_v1) / O2O2_O2F_ckd_mt_100_dv);
  if (V1C < O2O2_O2F_ckd_mt_100_v1) I1 = -1;
  V1C    = O2O2_O2F_ckd_mt_100_v1 + (O2O2_O2F_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-O2O2_O2F_ckd_mt_100_v1) / O2O2_O2F_ckd_mt_100_dv);

  int NPTC = I2-I1+3;
  if (NPTC > O2O2_O2F_ckd_mt_100_npt) NPTC = O2O2_O2F_ckd_mt_100_npt+1;

  V2C    = V1C + O2O2_O2F_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 O2 CIA fundamental band:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.\n";
      return;
    }

  Numeric xo2[NPTC+addF77fields];
  Numeric xo2t[NPTC+addF77fields];

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      xo2[J]  = 0.000e0;
      xo2t[J] = 0.000e0;
      Index I = I1+J;
      if ( (I > 0) && (I <= O2O2_O2F_ckd_mt_100_npt) )
  {
    xo2[J]  = O2O2_O2Fo_ckd_mt_100[I];
    xo2t[J] = O2O2_O2Ft_ckd_mt_100[I];
  }
    }

  // ------------------- subroutine O2_VER_1 ----------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      // FIXME Numeric vmro2  = vmr[i];                                 // [1]
      Numeric WTOT   = xLosmt * (Pave/PO) * (T1/Tave);         // [molecules/cm^2]
      Numeric tau_fac= WTOT * (Pave/PO) * (T1/Tave);

      Numeric XKT    = Tave / 1.4387752;                       // = (T*k_B) / (h*c)

      Numeric xktfac = (1.000e0/TO) - (1.000e0/Tave);          // [1/K]
      Numeric factor = (1.000e0 / xLosmt);

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    Numeric SO2 = 0.0e0;
    if (xo2[J] > 0.0e0)
      {
        Numeric C0 = factor * xo2[J] * exp(xo2t[J]*xktfac) / VJ;
        SO2 = tau_fac * C0;
      }

    // CKD cross section without radiative field
    k[J] = SO2 * RADFN_FUN(VJ,XKT); // [1]
  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > O2O2_O2F_ckd_mt_100_v1) && (V < O2O2_O2F_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// =================================================================================


void CKD_mt_v0v0_o2( MatrixView          pxsec,
         const Numeric       Cin,
         const String&       model,
         ConstVectorView     f_grid,
         ConstVectorView     abs_p,
         ConstVectorView     abs_t,
         ConstVectorView     vmr,
         ConstVectorView     abs_n2)
{


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 O2 band at 1.27 micrometer:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the O2 v0<-v0 band absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    };

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  // FIXME const Numeric xLosmt    = 2.686763e19; // Loschmidt Number [molecules/cm^3]
  const Numeric T1        =  273.0e0;
  // FIXME const Numeric TO        =  296.0e0;
  const Numeric PO        = 1013.0e0;

  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < O2_00_ckd_mt_100_v1) || (V1ABS > O2_00_ckd_mt_100_v2) ||
       (V2ABS < O2_00_ckd_mt_100_v1) || (V2ABS > O2_00_ckd_mt_100_v2) )
    {
      out3  << "WARNING:\n"
            << "   CKD_MT 1.00 O2 v0<-v0 band:\n"
      << "   input frequency vector exceeds range of model validity\n"
      << "  " << O2_00_ckd_mt_100_v1 << "<->" << O2_00_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine O2INF1 ----------------------------

  // retrieve the appropriate array sequence of the CKD model array.
  Numeric DVC = O2_00_ckd_mt_100_dv;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int I1 = (int) ((V1C-O2_00_ckd_mt_100_v1) / O2_00_ckd_mt_100_dv);
  if (V1C < O2_00_ckd_mt_100_v1) I1 = I1-1;
  V1C    = O2_00_ckd_mt_100_v1 + (O2_00_ckd_mt_100_dv * (Numeric)I1);

  int I2 = (int) ((V2C-O2_00_ckd_mt_100_v1) / O2_00_ckd_mt_100_dv);

  int NPTC = I2-I1+3;

  V2C    = V1C + O2_00_ckd_mt_100_dv * (Numeric)(NPTC-1);

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 O2 v0<-v0 band:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.\n";
      return;
    }

  Numeric CO[(int)(NPTC+addF77fields)];


  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      CO[J]  = 0.000e0;
      Index I = I1+J;
      if ( (I > 0) && (I <= O2_00_ckd_mt_100_npt) )
  {
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    CO[J]  = O2_00_ckd_mt_100[I] / VJ;
  }
    }

  // ------------------- subroutine O2INF1 ----------------------------




  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmro2  = vmr[i];                                 // [1]
      Numeric vmrn2  = abs_n2[i];                              // [1]
      Numeric ADJWO2 = (vmro2 + 0.300e0*vmrn2) / 0.446e0 *
                       (Pave/PO) * (Pave/PO) * (T1/Tave) * (T1/Tave);
      Numeric XKT    = Tave / 1.4387752e0;                     // = (T*k_B) / (h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid. The abs. coeff. is then the
      // cross section times the number density.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    Numeric SO2 = 0.0e0;
    if (CO[J] > 0.0e0)
      {
        SO2 = ADJWO2 * CO[J];
      }

    // CKD (cross section * number density) with radiative field
    k[J] = SO2 * RADFN_FUN(VJ,XKT); // [1/cm]
  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > O2_00_ckd_mt_100_v1) && (V < O2_00_ckd_mt_100_v2) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// =================================================================================


void CKD_mt_v1v0_o2( MatrixView          pxsec,
         const Numeric       Cin,
         const String&       model,
         ConstVectorView     f_grid,
         ConstVectorView     abs_p,
         ConstVectorView     abs_t,
         ConstVectorView     vmr )
{

  // check the model name about consistency
  if ((model != "user") &&  (model != "CKDMT100"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKD_MT1.00 O2 band at 1.06 micrometer:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKDMT100\n";
      throw runtime_error(os.str());
    }


  // scaling factor of the O2 v1<-v0 band absorption
  Numeric  ScalingFac = 1.0000e0;
  if ( model == "user" )
    {
      ScalingFac = Cin; // input scaling factor of calculated absorption
    };

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // ************************** CKD stuff ************************************

  const Numeric xLosmt    = 2.686763e19; // Loschmidt Number [molecules/cm^3]
  const Numeric T1        =  273.0e0;
  const Numeric TO        =  296.0e0;
  const Numeric PO        = 1013.0e0;
  // FIXME const Numeric vmr_argon = 9.000e-3;    // VMR of argon is assumed to be const.


  // CKD_MT 1.00 implementation of oxygen v1<-v0 band model of
  // Mlawer, Clough, Brown, Stephen, Landry, Goldman, Murcray,
  // "Observed  Atmospheric Collision Induced Absorption in Near Infrared Oxygen Bands",
  // Journal of Geophysical Research, vol 103, no. D4, pp. 3859-3863, 1998.
  const Numeric V1S    = O2_10_ckd_mt_100_v1;
  const Numeric V2S    = O2_10_ckd_mt_100_v2;
  const Numeric DVS    = O2_10_ckd_mt_100_dv;
  const Numeric V1_osc =  9375.000e0;
  const Numeric HW1    =    58.960e0;
  const Numeric V2_osc =  9439.000e0;
  const Numeric HW2    =    45.040e0;
  const Numeric S1     =     1.166e-4;
  const Numeric S2     =     3.086e-5;


  // It is assumed here that f_grid is monotonically increasing with index!
  // In future change this return into a change of the loop over
  // the frequency f_grid. n_f_new < n_f
  Numeric V1ABS = f_grid[0]     / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  Numeric V2ABS = f_grid[n_f-1] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
  if ( (V1ABS < O2_10_ckd_mt_100_v1) || (V1ABS > O2_10_ckd_mt_100_v2) ||
       (V2ABS < O2_10_ckd_mt_100_v1) || (V2ABS > O2_10_ckd_mt_100_v2) )
    {
      out3  << "WARNING:\n"
            << "   CKD_MT 1.00 O2 v1<-v0 band:\n"
      << "   input frequency vector exceeds range of model validity\n"
      << "  " << O2_10_ckd_mt_100_v1 << "<->" << O2_10_ckd_mt_100_v2 << "cm^-1\n";
    }


  // ------------------- subroutine O2INF2 ----------------------------

  // retrieve the appropriate array sequence of the CKD model array.
  Numeric DVC = DVS;
  Numeric V1C = V1ABS - DVC;
  Numeric V2C = V2ABS + DVC;

  int NPTC = (int)( ((V2C-V1C)/DVC) + 3 );

  V2C = V1C + ( DVC * (Numeric)(NPTC-1) );

  if (NPTC < 1)
    {
      out3 << "WARNING:\n"
     << "  CKD_MT 1.00 O2 v1<-v0 band:\n"
     << "  no elements of internal continuum coefficients could be found for the\n"
     << "  input frequency range.\n"
     << "  Leave the function without calculating the absorption.\n";
      return;
    }

  Numeric C[NPTC+addF77fields];
  C[0] = 0.000e0; // not used field of array

  for (Index J = 1 ; J <= NPTC ; ++J)
    {
      C[J]  = 0.000e0;
      Numeric VJ  = V1C + (DVC * (Numeric)(J-1));

      if ( (VJ > V1S) && (VJ < V2S) )
        {
    Numeric DV1 = VJ - V1_osc;
    Numeric DV2 = VJ - V2_osc;

    Numeric DAMP1 = 1.00e0;
    Numeric DAMP2 = 1.00e0;

    if ( DV1 < 0.00e0 )
      {
        DAMP1 = exp(DV1 / 176.100e0);
      }

    if ( DV2 < 0.00e0 )
      {
        DAMP2 = exp(DV2 / 176.100e0);
      }

    Numeric O2INF = 0.31831e0 *
                 ( ((S1 * DAMP1 / HW1)/(1.000e0 + pow((DV1/HW1),(Numeric)2.0e0) )) +
       ((S2 * DAMP2 / HW2)/(1.000e0 + pow((DV2/HW2),(Numeric)2.0e0) )) ) * 1.054e0;
    C[J] = O2INF / VJ;
  }
    }


  // ------------------- subroutine O2INF2 ----------------------------


  // Loop pressure/temperature:
  for ( Index i = 0 ; i < n_p ; ++i )
    {
      Numeric Tave   = abs_t[i];                               // [K]
      Numeric Pave   = (abs_p[i]*1.000e-2);                    // [hPa]
      Numeric vmro2  = vmr[i];                                 // [1]
      Numeric WTOT   = 1.000e-20 * xLosmt * (Pave/PO) * (T1/Tave); // [molecules/cm^2]
      Numeric ADJWO2 = (vmro2 / 0.209e0) * WTOT * (Pave/PO) * (TO/Tave);
      Numeric XKT    = Tave / 1.4387752;                       // = (T*k_B) / (h*c)

      // Molecular cross section calculated by CKD.
      // The cross sectionis calculated on the predefined
      // CKD wavenumber grid.
      Numeric k[NPTC+addF77fields]; // [1/cm]
      k[0] = 0.00e0; // not used array field
      for (Index J = 1 ; J <= NPTC ; ++J)
  {
    Numeric VJ  = V1C + (DVC * (Numeric)(J-1));
    Numeric SO2 = 0.0e0;
    if (C[J] > 0.0e0)
      {
        SO2 = ADJWO2 * C[J];
      }

    // CKD cross section without radiative field
    k[J] = SO2 * RADFN_FUN(VJ,XKT); // [1]
  }


      // Loop input frequency array. The previously calculated cross section
      // has therefore to be interpolated on the input frequencies.
      for ( Index s = 0 ; s < n_f ; ++s )
  {
    // calculate the associated wave number (= 1/wavelength)
    Numeric V = f_grid[s] / (SPEED_OF_LIGHT * 1.00e2); // [cm^-1]
    if ( (V > V1S) && (V < V2S) )
      {
        // arts cross section [1/m]
        // interpolate the k vector on the f_grid grid
        pxsec(s,i) +=  ScalingFac * 1.000e2 * XINT_FUN(V1C,V2C,DVC,k,V);
      }
  }
    }

}

// #################################################################################


void CKD24_H20( MatrixView          pxsec,
    int                 isf,
    const Numeric       Cin,
    const String&       model,
    ConstVectorView     f_grid,
    ConstVectorView     abs_p,
    ConstVectorView     abs_t,
    ConstVectorView     vmr,
                ConstVectorView     abs_n2 )
{
  //
  //
  // external function to call (original F77 code translated with f2c)
  /* INPUT PARAMETERS:                           */
  /*  P          [hPa]  TOTAL PRESSURE           */
  /*  T          [K]    TEMPERATURE              */
  /*  VMRH2O     [1]    H2O VOLUME MIXING RATIO  */
  /*  VMRN2      [1]    N2  VOLUME MIXING RATIO  */
  /*  VMRO2      [1]    O2  VOLUME MIXING RATIO  */
  /*  FREQ       [Hz]   FREQUENCY OF CALCULATION */
  extern double artsckd_(double p, double t,
       double vmrh2o, double vmrn2, double vmro2,
       double freq, int ivc);
  //
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  Numeric  XFAC  =  1.0000;             // scaling factor
  // ---------------------------------------------------------------------------------------


  // check the model name about consistency
  if ((model != "user") &&  (model != "CKD24"))
    {
      ostringstream os;
      os << "!!ERROR!!\n"
   << "CKDv2.4.2 H2O self/foreign continuum:\n"
   << "INPUT model name is: " << model << ".\n"
   << "VALID model names are user and CKD24\n";
      throw runtime_error(os.str());
    }


  // select the parameter set (!!model dominates values!!):
  if ( model == "CKD24" )
    {
      XFAC =  1.0000;
    }
  else if ( model == "user" )
    {
      XFAC =  Cin;
    }
  else
    {
      if (isf == 0) {
  ostringstream os;
  os << "H2O-SelfContCKD24: ERROR! Wrong model values given.\n"
     << "allowed models are: 'CKD24', 'user'" << '\n';
  throw runtime_error(os.str());
      }
      if (isf == 1) {
  ostringstream os;
  os << "H2O-ForeignContCKD: ERROR! Wrong model values given.\n"
     << "allowed models are: 'CKD24', 'user'" << '\n';
  throw runtime_error(os.str());
      }
    }

  if (isf == 0) {
    out3  << "H2O-SelfContCKD24: (model=" << model << ") parameter values in use:\n"
    << " XFAC = " << XFAC << "\n";
  }
  if (isf == 1) {
    out3  << "H2O-ForeignContCKD: (model=" << model << ") parameter values in use:\n"
    << " XFAC = " << XFAC << "\n";
  }


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  //  ivc = 1     : N2-N2 CKD version of Borysow-Fromhold model
  //  ivc = 21    : H2O CKD2.4  self cont part
  //  ivc = 22    : H2O CKD2.4  foreign cont part
  //  ivc = 31    : MPMf87/s93  self cont part
  //  ivc = 32    : MPMf87/s93  foreign cont part
  int ivc = 55;
  if (isf == 0) {
    ivc = 21; // CKD2.4  self continuum
    // ivc = 31; // MPMf87/s93  self continuum
  }
  if (isf == 1) {
    ivc = 22; // CKD2.4  foreign continuum
    //ivc = 32; // MPMf87/s93  foreign continuum
  }
  if ((ivc != 1) && (ivc != 21) && (ivc != 22) && (ivc != 31) && (ivc != 32)) {
    ostringstream os;
    os << "!!ERROR: CKD24 H2O model: wrong input parameter isf (=0,1) given!\n"
       << "retrun without calculation!" << "\n"
       << "actual value of isf is " << isf << "\n";
    throw runtime_error(os.str());
    return;
  }
  // ivc = 1;

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      double T      = (double) abs_t[i];            // [K]
      double p      = (double) (abs_p[i]*1.000e-2); // [hPa]
      double vmrh2o = (double) vmr[i];              // [1]
      double vmrn2  = (double) abs_n2[i];           // [1]
      double vmro2  = 0.0e0;                        // [1]

      //cout << "------------------------------------------------\n";
      //cout << "CKD2.4 H2O: ivc   =" << ivc << "\n";
      //cout << "CKD2.4 H2O: T     =" << T << " K\n";
      //cout << "CKD2.4 H2O: p     =" << p << " hPa\n";
      //cout << "CKD2.4 H2O: vmrh2o=" << vmrh2o << "\n";
      //cout << "CKD2.4 H2O: vmrn2 =" << vmrn2 << "\n";
      //cout << "CKD2.4 H2O: vmro2 =" << vmro2 << "\n";
      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    // the second vmr of N2 will be multiplied at the stage of
    // absorption calculation: abs =  vmr * pxsec.
    double f = (double) f_grid[s];            // [Hz]
    if (ivc == 1) { // ---------- N2 -----------------
      if (abs_n2[i] > 0.0e0) {
        //cout << "CKD2.4 N2: f   =" << f << " Hz\n";
        double cont = artsckd_(p, T, vmrh2o, vmrn2, vmro2, f, ivc);
        pxsec(s,i) +=  (Numeric) (cont / vmr[i]);
        //cout << "CKD2.4 N2: abs =" << cont << " 1/m\n";
      }
    } else { // ---------------- H2O -----------------
      if (vmr[i] > 0.0e0) {
        //cout << "CKD2.4 H2O: f   =" << f << " Hz\n";
        double cont = artsckd_(p, T, vmrh2o, vmrn2, vmro2, f, ivc);
        pxsec(s,i) +=  (Numeric) (cont / vmr[i]);
        //cout << "CKD2.4 H2O: abs =" << cont << " 1/m\n";
      }
    }
  }
    }
  return;
}
//
// #################################################################################

void Pardo_ATM_H2O_ForeignContinuum( MatrixView          pxsec,
             const Numeric       Cin,
             const String&       model,
             ConstVectorView     f_grid,
             ConstVectorView     abs_p,
             ConstVectorView     abs_t,
             ConstVectorView     vmr)
{
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Pardo et al. model (IEEE, Trans. Ant. Prop.,
  // Vol 49, No 12, pp. 1683-1694, 2001)
  const Numeric  C_ATM = 0.0315; // [1/m]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates parameters!!):
  Numeric C;
   if ( model == "ATM" )
     {
       C = C_ATM;
     }
   else if ( model == "user" )
     {
       C = Cin;
     }
   else
     {
       ostringstream os;
       os << "H2O-ForeignContATM01: ERROR! Wrong model values given.\n"
    << "allowed models are: 'ATM', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "H2O-ForeignContATM01: (model=" << model << ") parameter values in use:\n"
         << " C_f = " << C << "\n";

   const Index n_p = abs_p.nelem();  // Number of pressure levels
   const Index n_f = f_grid.nelem();  // Number of frequencies

   // Check that dimensions of abs_p, abs_t, and vmr agree:
   assert ( n_p==abs_t.nelem() );
   assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      // since this is an effective "dry air" continuum, it is not really
      // it is not specifically attributed to N2, so we need the total
      // dry air part in total which is equal to the total minus the
      // water vapor pressure:
      Numeric  pd = abs_p[i] * ( 1.00000e0 - vmr[i] ); // [Pa]
      // since the H2O VMR will be multiplied in abs_coefCalc, we omit it here
      Numeric  pwdummy = abs_p[i]                    ; // [Pa]
      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    // Becaue this is an effective "dry air" continuum, it is not really
    // specific N2 but mainly caused by N2. Therefore the N2 vmr must be
    // canceled out here which is later in abs_coefCalc multiplied
    // (calculation: abs = vmr * pxsec):
    pxsec(s,i) += C *                  // strength [1/(m*Hz²Pa²)]
      pow( (f_grid[s]/(Numeric)2.25e11), (Numeric)2. ) * // quadratic f dependence [1]
      pow( ((Numeric)300.0/abs_t[i]), (Numeric)3. ) * // free T dependence      [1]
      (pd/1.01300e5)                * // p_dry dependence       [1]
      (pwdummy/1.01300e5);            // p_H2O dependence       [1]
  }
    }
}
//
// #################################################################################
//

void MPM93_H2O_continuum( MatrixView          pxsec,
        const Numeric       fcenter,
        const Numeric       b1,
        const Numeric       b2,
        const Numeric       b3,
        const Numeric       b4,
        const Numeric       b5,
        const Numeric       b6,
        const String&       model,
        ConstVectorView     f_grid,
        ConstVectorView     abs_p,
        ConstVectorView     abs_t,
        ConstVectorView     vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 H2O continuum model
  // (AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21):
  const Numeric  MPM93fo_orig =  1780.000e9;  // [Hz]
  const Numeric  MPM93b1_orig = 22300.000;    // [Hz/Pa]
  const Numeric  MPM93b2_orig =     0.952;    // [1]
  const Numeric  MPM93b3_orig =    17.600e4;  // [Hz/Pa]
  const Numeric  MPM93b4_orig =    30.500;    // [1]
  const Numeric  MPM93b5_orig =     2.000;    // [1]
  const Numeric  MPM93b6_orig =     5.000;    // [1]
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model goes for values!!):
  Numeric MPM93fopcl, MPM93b1pcl, MPM93b2pcl,
          MPM93b3pcl, MPM93b4pcl, MPM93b5pcl,
          MPM93b6pcl;
  if ( model == "MPM93" )
    {
      MPM93fopcl =  MPM93fo_orig;
      MPM93b1pcl =  MPM93b1_orig;
      MPM93b2pcl =  MPM93b2_orig;
      MPM93b3pcl =  MPM93b3_orig;
      MPM93b4pcl =  MPM93b4_orig;
      MPM93b5pcl =  MPM93b5_orig;
      MPM93b6pcl =  MPM93b6_orig;
    }
  else if ( model == "user" )
     {
      MPM93fopcl =  fcenter;
      MPM93b1pcl =  b1;
      MPM93b2pcl =  b2;
      MPM93b3pcl =  b3;
      MPM93b4pcl =  b4;
      MPM93b5pcl =  b5;
      MPM93b6pcl =  b6;
    }
   else
     {
       ostringstream os;
       os << "H2O-ContMPM93: ERROR! Wrong model values given.\n"
    << "allowed models are: 'MPM93', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "H2O-ContMPM93: (model=" << model << ") parameter values in use:\n"
         << " fo = " << MPM93fopcl << "\n"
         << " b1 = " << MPM93b1pcl << "\n"
         << " b2 = " << MPM93b2pcl << "\n"
         << " b3 = " << MPM93b3pcl << "\n"
         << " b4 = " << MPM93b4pcl << "\n"
         << " b5 = " << MPM93b5pcl << "\n"
         << " b6 = " << MPM93b6pcl << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );


  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      Numeric th = 300.0 / abs_t[i];
      // the vmr of H2O will be multiplied at the stage of absorption calculation:
      // abs / vmr * pxsec.
      Numeric strength =  MPM93b1pcl * abs_p[i] * pow( th, (Numeric)3.5 )
        * exp(MPM93b2pcl * (1 - th));
      Numeric gam      =  MPM93b3pcl * 0.001 *
                    ( MPM93b4pcl * abs_p[i] * vmr[i]       * pow( th, MPM93b6pcl ) +
                                   abs_p[i]*(1.000-vmr[i]) * pow( th, MPM93b5pcl ) );
      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    // pxsec = abs/vmr [1/m] but MPM89 is in [dB/km] --> conversion necessary
    pxsec(s,i) += dB_km_to_1_m * 0.1820 *
                 f_grid[s] * strength *
                 MPMLineShapeFunction(gam, MPM93fopcl, f_grid[s]);
  }
    }
  return;
}
//
// #################################################################################
// ################################# OXYGEN MODELS #################################
// #################################################################################

void MPM85O2AbsModel( MatrixView          pxsec,
          const Numeric    CCin,       // continuum scale factor
          const Numeric    CLin,       // line strength scale factor
          const Numeric    CWin,       // line broadening scale factor
          const Numeric    COin,       // line coupling scale factor
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     abs_h2o,
          ConstVectorView     vmr )
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //      0             1           2         3          4      5         6
  //      f0           a1          a2        a3         a4     a5        a6
  //    [GHz]      [kHz/hPa]      [1]     [MHz/hPa]    [1]   [1/kPa]     [1]
  const Numeric mpm85[48][7] = {
   { 49.452379 ,       0.12 ,    11.830 ,    8.40 ,    0.0 ,  5.600 ,   1.700 },
   { 49.962257 ,       0.34 ,    10.720 ,    8.50 ,    0.0 ,  5.600 ,   1.700 },
   { 50.474238 ,       0.94 ,     9.690 ,    8.60 ,    0.0 ,  5.600 ,   1.700 },
   { 50.987748 ,       2.46 ,     8.690 ,    8.70 ,    0.0 ,  5.500 ,   1.700 },
   { 51.503350 ,       6.08 ,     7.740 ,    8.90 ,    0.0 ,  5.600 ,   1.800 },
   { 52.021409 ,      14.14 ,     6.840 ,    9.20 ,    0.0 ,  5.500 ,   1.800 },
   { 52.542393 ,      31.02 ,     6.000 ,    9.40 ,    0.0 ,  5.700 ,   1.800 },
   { 53.066906 ,      64.10 ,     5.220 ,    9.70 ,    0.0 ,  5.300 ,   1.900 },
   { 53.595748 ,     124.70 ,     4.480 ,   10.00 ,    0.0 ,  5.400 ,   1.800 },
   { 54.129999 ,     228.00 ,     3.810 ,   10.20 ,    0.0 ,  4.800 ,   2.000 },
   { 54.671157 ,     391.80 ,     3.190 ,   10.50 ,    0.0 ,  4.800 ,   1.900 },
   { 55.221365 ,     631.60 ,     2.620 ,   10.79 ,    0.0 ,  4.170 ,   2.100 },
   { 55.783800 ,     953.50 ,     2.115 ,   11.10 ,    0.0 ,  3.750 ,   2.100 },
   { 56.264777 ,     548.90 ,     0.010 ,   16.46 ,    0.0 ,  7.740 ,   0.900 },
   { 56.363387 ,    1344.00 ,     1.655 ,   11.44 ,    0.0 ,  2.970 ,   2.300 },
   { 56.968180 ,    1763.00 ,     1.255 ,   11.81 ,    0.0 ,  2.120 ,   2.500 },
   { 57.612481 ,    2141.00 ,     0.910 ,   12.21 ,    0.0 ,  0.940 ,   3.700 },
   { 58.323874 ,    2386.00 ,     0.621 ,   12.66 ,    0.0 , -0.550 ,  -3.100 },
   { 58.446589 ,    1457.00 ,     0.079 ,   14.49 ,    0.0 ,  5.970 ,   0.800 },
   { 59.164204 ,    2404.00 ,     0.386 ,   13.19 ,    0.0 , -2.440 ,   0.100 },
   { 59.590982 ,    2112.00 ,     0.207 ,   13.60 ,    0.0 ,  3.440 ,   0.500 },
   { 60.306057 ,    2124.00 ,     0.207 ,   13.82 ,    0.0 , -4.130 ,   0.700 },
   { 60.434775 ,    2461.00 ,     0.386 ,   12.97 ,    0.0 ,  1.320 ,  -1.000 },
   { 61.150558 ,    2504.00 ,     0.621 ,   12.48 ,    0.0 , -0.360 ,   5.800 },
   { 61.800152 ,    2298.00 ,     0.910 ,   12.07 ,    0.0 , -1.590 ,   2.900 },
   { 62.411212 ,    1933.00 ,     1.255 ,   11.71 ,    0.0 , -2.660 ,   2.300 },
   { 62.486253 ,    1517.00 ,     0.078 ,   14.68 ,    0.0 , -4.770 ,   0.900 },
   { 62.997974 ,    1503.00 ,     1.660 ,   11.39 ,    0.0 , -3.340 ,   2.200 },
   { 63.568515 ,    1087.00 ,     2.110 ,   11.08 ,    0.0 , -4.170 ,   2.000 },
   { 64.127764 ,     733.50 ,     2.620 ,   10.78 ,    0.0 , -4.480 ,   2.000 },
   { 64.678900 ,     463.50 ,     3.190 ,   10.50 ,    0.0 , -5.100 ,   1.800 },
   { 65.224067 ,     274.80 ,     3.810 ,   10.20 ,    0.0 , -5.100 ,   1.900 },
   { 65.764769 ,     153.00 ,     4.480 ,   10.00 ,    0.0 , -5.700 ,   1.800 },
   { 66.302088 ,      80.09 ,     5.220 ,    9.70 ,    0.0 , -5.500 ,   1.800 },
   { 66.836827 ,      39.46 ,     6.000 ,    9.40 ,    0.0 , -5.900 ,   1.700 },
   { 67.369595 ,      18.32 ,     6.840 ,    9.20 ,    0.0 , -5.600 ,   1.800 },
   { 67.900862 ,       8.01 ,     7.740 ,    8.90 ,    0.0 , -5.800 ,   1.700 },
   { 68.431001 ,       3.30 ,     8.690 ,    8.70 ,    0.0 , -5.700 ,   1.700 },
   { 68.960306 ,       1.28 ,     9.690 ,    8.60 ,    0.0 , -5.600 ,   1.700 },
   { 69.489021 ,       0.47 ,    10.720 ,    8.50 ,    0.0 , -5.600 ,   1.700 },
   { 70.017342 ,       0.16 ,    11.830 ,    8.40 ,    0.0 , -5.600 ,   1.700 },
  { 118.750341 ,     945.00 ,     0.000 ,   15.92 ,    0.0 , -0.440 ,   0.900 },
  { 368.498350 ,      67.90 ,     0.020 ,   19.20 ,    0.6 ,  0.000 ,   0.000 },
  { 424.763120 ,     638.00 ,     0.011 ,   19.16 ,    0.6 ,  0.000 ,   0.000 },
  { 487.249370 ,     235.00 ,     0.011 ,   19.20 ,    0.6 ,  0.000 ,   0.000 },
  { 715.393150 ,      99.60 ,     0.089 ,   18.10 ,    0.6 ,  0.000 ,   0.000 },
  { 773.838730 ,     671.00 ,     0.079 ,   18.10 ,    0.6 ,  0.000 ,   0.000 },
  { 834.145330 ,     180.00 ,     0.079 ,   18.10 ,    0.6 ,  0.000 ,   0.000 },
};

  // number of lines of Liebe O2-line catalog (0-47 lines)
  const Index i_first = 0;
  const Index i_last  = 47; // all the spec. lines up to 1THz
  // const Index i_last  = 40; // only the 60GHz complex + 118GHz line


  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM85 model (Liebe, Radio Science, 20, 1069-1089, 1985):
  const Numeric CC_MPM85 = 1.00000;
  const Numeric CL_MPM85 = 1.00000;
  const Numeric CW_MPM85 = 1.00000;
  const Numeric CO_MPM85 = 1.00000;
  int   AppCutoff = 0;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO;
  if ( model == "MPM85" )
    {
      CC = CC_MPM85;
      CL = CL_MPM85;
      CW = CW_MPM85;
      CO = CO_MPM85;
    }
  else if ( model == "MPM85Lines" )
    {
      CC = 0.000;
      CL = CL_MPM85;
      CW = CW_MPM85;
      CO = CO_MPM85;
    }
  else if ( model == "MPM85Continuum" )
    {
      CC = CC_MPM85;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "MPM85NoCoupling" )
    {
      CC = CC_MPM85;
      CL = CL_MPM85;
      CW = CW_MPM85;
      CO = 0.000;
    }
  else if ( model == "MPM85NoCutoff" )
    {
      CC = CC_MPM85;
      CL = CL_MPM85;
      CW = CW_MPM85;
      CO = CO_MPM85;
      AppCutoff = 1;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-MPM85: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM85' 'MPM85Lines' 'MPM85Continuum' 'MPM85NoCoupling' 'MPM85NoCutoff'"
         << "and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-MPM85: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // O2 continuum parameters of MPM92:
  const Numeric  S0 =  6.140e-4; // line strength                        [ppm]
  const Numeric G0 =  5.600e-3;  // line width                           [GHz/kPa]
  const Numeric  X0 =  0.800;    // temperature dependence of line width [1]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: MPM87 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }

      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [kPa]
      Numeric pwv       = Pa_to_kPa * abs_p[i] * abs_h2o[i];
      // dry air partial pressure [kPa]
      Numeric pda       = (Pa_to_kPa * abs_p[i]) - pwv;
      // here the total pressure is devided by the O2 vmr for the
      // P_dry calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pda_dummy = pda;
      // O2 continuum strength [ppm]
      Numeric strength_cont =  S0 * pda_dummy * pow( theta, (Numeric)2. );
      // O2 continuum pseudo line broadening [GHz]
      Numeric gam_cont      =  G0 * ( pda + 1.10*pwv ) *  pow( theta, X0 ); // GHz

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;
    // O2 continuum absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    // here the rolloff parameter FAC is implemented!
    // Numeric FAC =  1.000 / ( pow( ff, 2) + pow( 60.000, 2) );
    // if we let the non-proofen rollofff away as in further version:
    Numeric FAC =  1.000 ;
    Numeric Nppc =  CC * strength_cont * FAC * ff * gam_cont /
                    ( pow( ff, (Numeric)2.)
                            + pow( gam_cont, (Numeric)2.) );

    // Loop over MPM85 O2 spectral lines:
    Numeric Nppl  = 0.0;
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]   S=A(1,I)*P*V**3*EXP(A(2,I)*(1.-V))*1.E-6
        Numeric strength = CL * mpm85[l][1] * 1.000e-6  * pda_dummy *
                          pow(theta, (Numeric)3.) * exp(mpm85[l][2]*(1.000-theta)) /
                          mpm85[l][0];
        // line broadening parameter [GHz]
        Numeric gam      = CW * ( mpm85[l][3] * 1.000e-3 *
                                ( (       pda * pow(theta, ((Numeric)0.80-mpm85[l][4]))) +
                                        (1.10 * pwv * theta) ) );
        // line mixing parameter [1]
        Numeric delta    = CO * mpm85[l][5] * 1.000e-3 *
                    pda * pow(theta, mpm85[l][6]);
        // absorption [dB/km] like in the original MPM92
        Nppl            += strength * MPMLineShapeO2Function(gam, mpm85[l][0], ff, delta);
      }
    // in MPM85 there is a cutoff for O2 line absorption if abs_l < 0
    // absorption cannot be less than 0 according to MPM87 philosophy.
    // since this cutoff is only 'detectable' in the source code and not in the
          // publications we assume this cutoff also for MPM85 since it is also
          // implemented in MPM87.
    if (AppCutoff == 0)
      {
        if (Nppl < 0.000)  Nppl = 0.0000;
      }
    //
    // O2 line absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * (Nppl+Nppc) / VMRISO;
  }
    }
  return;
}
//
// #################################################################################

void MPM87O2AbsModel( MatrixView          pxsec,
          const Numeric    CCin,       // continuum scale factor
          const Numeric    CLin,       // line strength scale factor
          const Numeric    CWin,       // line broadening scale factor
          const Numeric    COin,       // line coupling scale factor
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     abs_h2o,
          ConstVectorView     vmr )
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0            1           2        3          4        5        6
  //         f0           a1          a2       a3         a4      a5        a6
  //        [GHz]      [kHz/hPa]     [1]    [MHz/hPa]    [1]         [1/kPa]
  const Numeric mpm87[48][7] = {
    { 49.452379 ,       0.12 ,    11.830 ,    8.40 ,    0.0 ,  6.600 ,   1.700}, // 0
    { 49.962257 ,       0.34 ,    10.720 ,    8.50 ,    0.0 ,  6.600 ,   1.700}, // 1
    { 50.474238 ,       0.94 ,     9.690 ,    8.60 ,    0.0 ,  6.600 ,   1.700}, // 2
    { 50.987748 ,       2.46 ,     8.690 ,    8.70 ,    0.0 ,  6.500 ,   1.700}, // 3
    { 51.503350 ,       6.08 ,     7.740 ,    8.90 ,    0.0 ,  6.627 ,   1.800}, // 4
    { 52.021409 ,      14.14 ,     6.840 ,    9.20 ,    0.0 ,  6.347 ,   1.800}, // 5
    { 52.542393 ,      31.02 ,     6.000 ,    9.40 ,    0.0 ,  6.046 ,   1.800}, // 6
    { 53.066906 ,      64.10 ,     5.220 ,    9.70 ,    0.0 ,  5.719 ,   1.900}, // 7
    { 53.595748 ,     124.70 ,     4.480 ,   10.00 ,    0.0 ,  5.400 ,   1.800}, // 8
    { 54.129999 ,     228.00 ,     3.810 ,   10.20 ,    0.0 ,  5.157 ,   2.000}, // 9
    { 54.671157 ,     391.80 ,     3.190 ,   10.50 ,    0.0 ,  4.783 ,   1.900}, // 10
    { 55.221365 ,     631.60 ,     2.620 ,   10.79 ,    0.0 ,  4.339 ,   2.100}, // 11
    { 55.783800 ,     953.50 ,     2.115 ,   11.10 ,    0.0 ,  4.011 ,   2.100}, // 12
    { 56.264777 ,     548.90 ,     0.010 ,   16.46 ,    0.0 ,  2.772 ,   0.900}, // 13
    { 56.363387 ,    1344.00 ,     1.655 ,   11.44 ,    0.0 ,  3.922 ,   2.300}, // 14
    { 56.968180 ,    1763.00 ,     1.255 ,   11.81 ,    0.0 ,  3.398 ,   2.500}, // 15
    { 57.612481 ,    2141.00 ,     0.910 ,   12.21 ,    0.0 ,  1.145 ,   3.200}, // 16
    { 58.323874 ,    2386.00 ,     0.621 ,   12.66 ,    0.0 , -0.317 ,  -2.500}, // 17
    { 58.446589 ,    1457.00 ,     0.079 ,   14.49 ,    0.0 ,  6.270 ,   0.800}, // 18
    { 59.164204 ,    2404.00 ,     0.386 ,   13.19 ,    0.0 , -4.119 ,   0.100}, // 19
    { 59.590982 ,    2112.00 ,     0.207 ,   13.60 ,    0.0 ,  6.766 ,   0.500}, // 20
    { 60.306057 ,    2124.00 ,     0.207 ,   13.82 ,    0.0 , -6.183 ,   0.700}, // 21
    { 60.434775 ,    2461.00 ,     0.386 ,   12.97 ,    0.0 ,  3.290 ,  -0.400}, // 22
    { 61.150558 ,    2504.00 ,     0.621 ,   12.48 ,    0.0 , -1.591 ,   3.500}, // 23
    { 61.800152 ,    2298.00 ,     0.910 ,   12.07 ,    0.0 , -2.068 ,   2.900}, // 24
    { 62.411212 ,    1933.00 ,     1.255 ,   11.71 ,    0.0 , -4.158 ,   2.300}, // 25
    { 62.486253 ,    1517.00 ,     0.078 ,   14.68 ,    0.0 , -4.068 ,   0.900}, // 26
    { 62.997974 ,    1503.00 ,     1.660 ,   11.39 ,    0.0 , -4.482 ,   2.200}, // 27
    { 63.568515 ,    1087.00 ,     2.110 ,   11.08 ,    0.0 , -4.442 ,   2.000}, // 28
    { 64.127764 ,     733.50 ,     2.620 ,   10.78 ,    0.0 , -4.687 ,   2.000}, // 29
    { 64.678900 ,     463.50 ,     3.190 ,   10.50 ,    0.0 , -5.074 ,   1.800}, // 30
    { 65.224067 ,     274.80 ,     3.810 ,   10.20 ,    0.0 , -5.403 ,   1.900}, // 31
    { 65.764769 ,     153.00 ,     4.480 ,   10.00 ,    0.0 , -5.610 ,   1.800}, // 32
    { 66.302088 ,      80.09 ,     5.220 ,    9.70 ,    0.0 , -5.896 ,   1.800}, // 33
    { 66.836827 ,      39.46 ,     6.000 ,    9.40 ,    0.0 , -6.194 ,   1.700}, // 34
    { 67.369595 ,      18.32 ,     6.840 ,    9.20 ,    0.0 , -6.468 ,   1.800}, // 35
    { 67.900862 ,       8.01 ,     7.740 ,    8.90 ,    0.0 , -6.718 ,   1.700}, // 36
    { 68.431001 ,       3.30 ,     8.690 ,    8.70 ,    0.0 , -6.700 ,   1.700}, // 37
    { 68.960306 ,       1.28 ,     9.690 ,    8.60 ,    0.0 , -6.600 ,   1.700}, // 38
    { 69.489021 ,       0.47 ,    10.720 ,    8.50 ,    0.0 , -6.600 ,   1.700}, // 39
    { 70.017342 ,       0.16 ,    11.830 ,    8.40 ,    0.0 , -6.600 ,   1.700}, // 40
   { 118.750341 ,     945.00 ,     0.000 ,   16.30 ,    0.0 , -0.134 ,   0.800}, // 41
  {  368.498350 ,      67.90 ,     0.020 ,   19.20 ,    0.6 ,  0.000 ,   0.000}, // 42
  {  424.763120 ,     638.00 ,     0.011 ,   19.16 ,    0.6 ,  0.000 ,   0.000}, // 43
  {  487.249370 ,     235.00 ,     0.011 ,   19.20 ,    0.6 ,  0.000 ,   0.000}, // 44
  {  715.393150 ,      99.60 ,     0.089 ,   18.10 ,    0.6 ,  0.000 ,   0.000}, // 45
  {  773.838730 ,     671.00 ,     0.079 ,   18.10 ,    0.6 ,  0.000 ,   0.000}, // 46
  {  834.145330 ,     180.00 ,     0.079 ,   18.10 ,    0.6 ,  0.000 ,   0.000}  // 47
  };

  // number of lines of Liebe O2-line catalog (0-47 lines)
  const Index i_first = 0;
  const Index i_last  = 47; // all the spec. lines up to 1THz
  // const Index i_last  = 40; // only the 60GHz complex + 118GHz line


  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM87 model (NITA Report 87-224):
  const Numeric CC_MPM87 = 1.00000;
  const Numeric CL_MPM87 = 1.00000;
  const Numeric CW_MPM87 = 1.00000;
  const Numeric CO_MPM87 = 1.00000;
  int   AppCutoff = 0;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO;
  if ( model == "MPM87" )
    {
      CC = CC_MPM87;
      CL = CL_MPM87;
      CW = CW_MPM87;
      CO = CO_MPM87;
    }
  else if ( model == "MPM87Lines" )
    {
      CC = 0.000;
      CL = CL_MPM87;
      CW = CW_MPM87;
      CO = CO_MPM87;
    }
  else if ( model == "MPM87Continuum" )
    {
      CC = CC_MPM87;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "MPM87NoCoupling" )
    {
      CC = CC_MPM87;
      CL = CL_MPM87;
      CW = CW_MPM87;
      CO = 0.000;
    }
  else if ( model == "MPM87NoCutoff" )
    {
      // !!ATTENTION!!
      // In the window regions the total absorption can get negative values.
      // So be carefull with this selection!
      CC = CC_MPM87;
      CL = CL_MPM87;
      CW = CW_MPM87;
      CO = CO_MPM87;
      AppCutoff = 1;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-MPM87: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM87' 'MPM87Lines' 'MPM87Continuum' 'MPM87NoCoupling' 'MPM87NoCutoff'"
         << "and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-MPM87: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // O2 continuum parameters of MPM92:
  const Numeric  S0 =  6.140e-4; // line strength                        [ppm]
  const Numeric G0 =  4.800e-3;  // line width [GHz/kPa] !! 14% lower than in all the other versions !!
  const Numeric  X0 =  0.800;    // temperature dependence of line width [1]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: MPM87 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }

      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [kPa]
      Numeric pwv       = Pa_to_kPa * abs_p[i] * abs_h2o[i];
      // dry air partial pressure [kPa]
      Numeric pda       = (Pa_to_kPa * abs_p[i]) - pwv;
      // here the total pressure is devided by the O2 vmr for the
      // P_dry calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pda_dummy = pda;
      // O2 continuum strength [ppm]
      Numeric strength_cont =  S0 * pda_dummy * pow( theta, (Numeric)2. );
      // O2 continuum pseudo line broadening [GHz]
      Numeric gam_cont      =  G0 * ( pda + 1.10*pwv ) *  pow( theta, X0 ); // GHz

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;
    // O2 continuum absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    Numeric Nppc =  CC * strength_cont * ff * gam_cont /
                    ( pow( ff, (Numeric)2.) + pow( gam_cont, (Numeric)2.) );

    // Loop over MPM87 O2 spectral lines:
    Numeric Nppl  = 0.0;
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]   S=A(1,I)*P*V**3*EXP(A(2,I)*(1.-V))*1.E-6
        Numeric strength = CL * mpm87[l][1] * 1.000e-6  * pda_dummy *
                          pow(theta, (Numeric)3.) * exp(mpm87[l][2]*(1.000-theta)) /
                          mpm87[l][0];
        // line broadening parameter [GHz]
        Numeric gam      = CW * ( mpm87[l][3] * 1.000e-3 *
                                ( (       pda * pow(theta, ((Numeric)0.80-mpm87[l][4]))) +
                                        (1.10 * pwv * theta) ) );
        // line mixing parameter [1]
        Numeric delta    = CO * mpm87[l][5] * 1.000e-3 *
                    pda * pow(theta, mpm87[l][6]);
        // absorption [dB/km] like in the original MPM92
        Nppl            += strength * MPMLineShapeO2Function(gam, mpm87[l][0], ff, delta);
      }
    // in MPM87 there is a cutoff for O2 line absorption if abs_l < 0
    // absorption cannot be less than 0 according to MPM87 source code.
    if (AppCutoff == 0)
      {
        if (Nppl < 0.000)  Nppl = 0.0000;
      }
    //
    // O2 line absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * (Nppl+Nppc) / VMRISO;
  }
    }
  return;
}
//
// #################################################################################

void MPM89O2AbsModel( MatrixView          pxsec,
          const Numeric    CCin,       // continuum scale factor
          const Numeric    CLin,       // line strength scale factor
          const Numeric    CWin,       // line broadening scale factor
          const Numeric    COin,       // line coupling scale factor
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     abs_h2o,
          ConstVectorView     vmr )
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0            1           2        3          4        5        6
  //         f0           a1          a2       a3         a4      a5        a6
  //        [GHz]      [kHz/hPa]     [1]    [MHz/hPa]    [1]         [1/kPa]
  const Numeric mpm89[44][7] = {
    {   50.474238,        0.94 ,    9.694 ,    8.60 ,    0.0 ,  1.600 ,   5.520 }, // 0
    {   50.987749,        2.46 ,    8.694 ,    8.70 ,    0.0 ,  1.400 ,   5.520 }, // 1
    {   51.503350,        6.08 ,    7.744 ,    8.90 ,    0.0 ,  1.165 ,   5.520 }, // 2
    {   52.021410,       14.14 ,    6.844 ,    9.20 ,    0.0 ,  0.883 ,   5.520 }, // 3
    {   52.542394,       31.02 ,    6.004 ,    9.40 ,    0.0 ,  0.579 ,   5.520 }, // 4
    {   53.066907,       64.10 ,    5.224 ,    9.70 ,    0.0 ,  0.252 ,   5.520 }, // 5
    {   53.595749,      124.70 ,    4.484 ,   10.00 ,    0.0 , -0.066 ,   5.520 }, // 6
    {   54.130000,      228.00 ,    3.814 ,   10.20 ,    0.0 , -0.314 ,   5.520 }, // 7
    {   54.671159,      391.80 ,    3.194 ,   10.50 ,    0.0 , -0.706 ,   5.520 }, // 8
    {   55.221367,      631.60 ,    2.624 ,   10.79 ,    0.0 , -1.151 ,   5.514 }, // 9
    {   55.783802,      953.50 ,    2.119 ,   11.10 ,    0.0 , -0.920 ,   5.025 }, // 10
    {   56.264775,      548.90 ,    0.015 ,   16.46 ,    0.0 ,  2.881 ,  -0.069 }, // 11
    {   56.363389,     1344.00 ,    1.660 ,   11.44 ,    0.0 , -0.596 ,   4.750 }, // 12
    {   56.968206,     1763.00 ,    1.260 ,   11.81 ,    0.0 , -0.556 ,   4.104 }, // 13
    {   57.612484,     2141.00 ,    0.915 ,   12.21 ,    0.0 , -2.414 ,   3.536 }, // 14
    {   58.323877,     2386.00 ,    0.626 ,   12.66 ,    0.0 , -2.635 ,   2.686 }, // 15
    {   58.446590,     1457.00 ,    0.084 ,   14.49 ,    0.0 ,  6.848 ,  -0.647 }, // 16
    {   59.164207,     2404.00 ,    0.391 ,   13.19 ,    0.0 , -6.032 ,   1.858 }, // 17
    {   59.590983,     2112.00 ,    0.212 ,   13.60 ,    0.0 ,  8.266 ,  -1.413 }, // 18
    {   60.306061,     2124.00 ,    0.212 ,   13.82 ,    0.0 , -7.170 ,   0.916 }, // 19
    {   60.434776,     2461.00 ,    0.391 ,   12.97 ,    0.0 ,  5.664 ,  -2.323 }, // 20
    {   61.150560,     2504.00 ,    0.626 ,   12.48 ,    0.0 ,  1.731 ,  -3.039 }, // 21
    {   61.800154,     2298.00 ,    0.915 ,   12.07 ,    0.0 ,  1.738 ,  -3.797 }, // 22
    {   62.411215,     1933.00 ,    1.260 ,   11.71 ,    0.0 , -0.048 ,  -4.277 }, // 23
    {   62.486260,     1517.00 ,    0.083 ,   14.68 ,    0.0 , -4.290 ,   0.238 }, // 24
    {   62.997977,     1503.00 ,    1.665 ,   11.39 ,    0.0 ,  0.134 ,  -4.860 }, // 25
    {   63.568518,     1087.00 ,    2.115 ,   11.08 ,    0.0 ,  0.541 ,  -5.079 }, // 26
    {   64.127767,      733.50 ,    2.620 ,   10.78 ,    0.0 ,  0.814 ,  -5.525 }, // 27
    {   64.678903,      463.50 ,    3.195 ,   10.50 ,    0.0 ,  0.415 ,  -5.520 }, // 28
    {   65.224071,      274.80 ,    3.815 ,   10.20 ,    0.0 ,  0.069 ,  -5.520 }, // 29
    {   65.764772,      153.00 ,    4.485 ,   10.00 ,    0.0 , -0.143 ,  -5.520 }, // 30
    {   66.302091,       80.09 ,    5.225 ,    9.70 ,    0.0 , -0.428 ,  -5.520 }, // 31
    {   66.836830,       39.46 ,    6.005 ,    9.40 ,    0.0 , -0.726 ,  -5.520 }, // 32
    {   67.369598,       18.32 ,    6.845 ,    9.20 ,    0.0 , -1.002 ,  -5.520 }, // 33
    {   67.900867,        8.01 ,    7.745 ,    8.90 ,    0.0 , -1.255 ,  -5.520 }, // 34
    {   68.431005,        3.30 ,    8.695 ,    8.70 ,    0.0 , -1.500 ,  -5.520 }, // 35
    {   68.960311,        1.28 ,    9.695 ,    8.60 ,    0.0 , -1.700 ,  -5.520 }, // 36
    {  118.750343,      945.00 ,    0.009 ,   16.30 ,    0.0 , -0.247 ,   0.003 }, // 37
    {  368.498350,       67.90 ,    0.049 ,   19.20 ,    0.6 ,  0.000 ,   0.000 }, // 38
    {  424.763124,      638.00 ,    0.044 ,   19.16 ,    0.6 ,  0.000 ,   0.000 }, // 39
    {  487.249370,      235.00 ,    0.049 ,   19.20 ,    0.6 ,  0.000 ,   0.000 }, // 40
    {  715.393150,       99.60 ,    0.145 ,   18.10 ,    0.6 ,  0.000 ,   0.000 }, // 41
    {  773.839675,      671.00 ,    0.130 ,   18.10 ,    0.6 ,  0.000 ,   0.000 }, // 42
    {  834.145330,      180.00 ,    0.147 ,   18.10 ,    0.6 ,  0.000 ,   0.000 }  // 43
  };

  // number of lines of Liebe O2-line catalog (0-43 lines)
  const Index i_first = 0;
  const Index i_last  = 43; // all the spec. lines up to 1THz
  // const Index i_last  = 37; // only the 60GHz complex + 118GHz line


  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM89 model (IJIMW, Vol 10, pp. 631-650, 1989):
  const Numeric CC_MPM89 = 1.00000;
  const Numeric CL_MPM89 = 1.00000;
  const Numeric CW_MPM89 = 1.00000;
  const Numeric CO_MPM89 = 1.00000;
  int   AppCutoff = 0;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO;
  if ( model == "MPM89" )
    {
      CC = CC_MPM89;
      CL = CL_MPM89;
      CW = CW_MPM89;
      CO = CO_MPM89;
    }
  else if ( model == "MPM89Lines" )
    {
      CC = 0.000;
      CL = CL_MPM89;
      CW = CW_MPM89;
      CO = CO_MPM89;
    }
  else if ( model == "MPM89Continuum" )
    {
      CC = CC_MPM89;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "MPM89NoCoupling" )
    {
      CC = CC_MPM89;
      CL = CL_MPM89;
      CW = CW_MPM89;
      CO = 0.000;
    }
  else if ( model == "MPM89NoCutoff" )
    {
      CC = CC_MPM89;
      CL = CL_MPM89;
      CW = CW_MPM89;
      CO = CO_MPM89;
      AppCutoff = 1;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-MPM89: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM89' 'MPM89Lines' 'MPM89Continuum' 'MPM89NoCoupling' 'MPM89NoCutoff'"
         << "and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-MPM89: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // O2 continuum parameters of MPM92:
  const Numeric  S0 =  6.140e-4; // line strength                        [ppm]
  const Numeric G0 =  5.60e-3;  // line width                           [GHz/kPa]
  const Numeric  X0 =  0.800;    // temperature dependence of line width [1]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: MPM89 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }

      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [kPa]
      Numeric pwv       = Pa_to_kPa * abs_p[i] * abs_h2o[i];
      // dry air partial pressure [kPa]
      Numeric pda       = (Pa_to_kPa * abs_p[i]) - pwv;
      // here the total pressure is devided by the O2 vmr for the
      // P_dry calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pda_dummy = pda;
      // O2 continuum strength [ppm]
      Numeric strength_cont =  S0 * pda_dummy * pow( theta, (Numeric)2. );
      // O2 continuum pseudo line broadening [GHz]
      Numeric gam_cont      =  G0 * (pwv+pda) *  pow( theta, X0 ); // GHz

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;
    // O2 continuum absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    Numeric Nppc =  CC * strength_cont * ff * gam_cont /
                    ( pow( ff, (Numeric)2.) + pow( gam_cont, (Numeric)2.) );

    // Loop over MPM89 O2 spectral lines:
    Numeric Nppl  = 0.0;
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]   S=A(1,I)*P*V**3*EXP(A(2,I)*(1.-V))*1.E-6
        Numeric strength = CL * mpm89[l][1] * 1.000e-6  * pda_dummy *
                          pow(theta, (Numeric)3.) * exp(mpm89[l][2]*(1.000-theta)) /
                          mpm89[l][0];
        // line broadening parameter [GHz]
        Numeric gam      = CW * ( mpm89[l][3] * 1.000e-3 *
                                ( (       pda * pow(theta, ((Numeric)0.80-mpm89[l][4]))) +
                                        (1.10 * pwv * theta) ) );
        // line mixing parameter [1]
        Numeric delta    = CO * ( (mpm89[l][5] + mpm89[l][6] * theta) * 1.000e-3 *
                      pda * pow(theta, (Numeric)0.8) );
        // absorption [dB/km] like in the original MPM92
        Nppl            += strength * MPMLineShapeO2Function(gam, mpm89[l][0], ff, delta);
      }
    // in MPM89 we adopt the cutoff for O2 line absorption if abs_l < 0
    // absorption cannot be less than 0 according to MPM87 source code.
    if (AppCutoff == 0)
      {
        if (Nppl < 0.000)  Nppl = 0.0000;
      }
    //
    // O2 line absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * (Nppl+Nppc) / VMRISO;
  }
    }
  return;
}
//
// #################################################################################
//

void MPM92O2AbsModel( MatrixView          pxsec,
          const Numeric    CCin,       // continuum scale factor
          const Numeric    CLin,       // line strength scale factor
          const Numeric    CWin,       // line broadening scale factor
          const Numeric    COin,       // line coupling scale factor
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     abs_h2o,
          ConstVectorView     vmr )
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0           1            2       3        4      5      6
  //         f0          a1           a2      a3       a4     a5     a6
  //        [GHz]     [kHz/hPa]      [1]   [MHz/hPa]  [1]    [10³/hPa]
  const Numeric mpm92[44][7] = {
    {   50.474238,       0.094,      9.694,    0.850,     0.0,   0.210,    0.685}, // 0
    {   50.987749,       0.246,      8.694,    0.870,     0.0,   0.190,    0.680}, // 1
    {   51.503350,       0.608,      7.744,    0.890,     0.0,   0.171,    0.673}, // 2
    {   52.021410,       1.414,      6.844,    0.920,     0.0,   0.144,    0.664}, // 3
    {   52.542394,       3.102,      6.004,    0.940,     0.0,   0.118,    0.653}, // 4
    {   53.066907,       6.410,      5.224,    0.970,     0.0,   0.114,    0.621}, // 5
    {   53.595749,      12.470,      4.484,    1.000,     0.0,   0.200,    0.508}, // 6
    {   54.130000,      22.800,      3.814,    1.020,     0.0,   0.291,    0.375}, // 7
    {   54.671159,      39.180,      3.194,    1.050,     0.0,   0.325,    0.265}, // 8
    {   55.221367,      63.160,      2.624,    1.080,     0.0,   0.224,    0.295}, // 9
    {   55.783802,      95.350,      2.119,    1.110,     0.0,  -0.144,    0.613}, // 0
    {   56.264775,      54.890,      0.015,    1.646,     0.0,   0.339,   -0.098}, // 11
    {   56.363389,     134.400,      1.660,    1.144,     0.0,  -0.258,    0.655}, // 12
    {   56.968206,     176.300,      1.260,    1.181,     0.0,  -0.362,    0.645}, // 13
    {   57.612484,     214.100,      0.915,    1.221,     0.0,  -0.533,    0.606}, // 14
    {   58.323877,     238.600,      0.626,    1.266,     0.0,  -0.178,    0.044}, // 15
    {   58.446590,     145.700,      0.084,    1.449,     0.0,   0.650,   -0.127}, // 16
    {   59.164207,     240.400,      0.391,    1.319,     0.0,  -0.628,    0.231}, // 17
    {   59.590983,     211.200,      0.212,    1.360,     0.0,   0.665,   -0.078}, // 18
    {   60.306061,     212.400,      0.212,    1.382,     0.0,  -0.613,    0.070}, // 19
    {   60.434776,     246.100,      0.391,    1.297,     0.0,   0.606,   -0.282}, // 20
    {   61.150560,     250.400,      0.626,    1.248,     0.0,   0.090,   -0.058}, // 21
    {   61.800154,     229.800,      0.915,    1.207,     0.0,   0.496,   -0.662}, // 22
    {   62.411215,     193.300,      1.260,    1.171,     0.0,   0.313,   -0.676}, // 23
    {   62.486260,     151.700,      0.083,    1.468,     0.0,  -0.433,    0.084}, // 24
    {   62.997977,     150.300,      1.665,    1.139,     0.0,   0.208,   -0.668}, // 25
    {   63.568518,     108.700,      2.115,    1.110,     0.0,   0.094,   -0.614}, // 26
    {   64.127767,      73.350,      2.620,    1.080,     0.0,  -0.270,   -0.289}, // 27
    {   64.678903,      46.350,      3.195,    1.050,     0.0,  -0.366,   -0.259}, // 28
    {   65.224071,      27.480,      3.815,    1.020,     0.0,  -0.326,   -0.368}, // 29
    {   65.764772,      15.300,      4.485,    1.000,     0.0,  -0.232,   -0.500}, // 30
    {   66.302091,       8.009,      5.225,    0.970,     0.0,  -0.146,   -0.609}, // 31
    {   66.836830,       3.946,      6.005,    0.940,     0.0,  -0.147,   -0.639}, // 32
    {   67.369598,       1.832,      6.845,    0.920,     0.0,  -0.174,   -0.647}, // 33
    {   67.900867,       0.801,      7.745,    0.890,     0.0,  -0.198,   -0.655}, // 34
    {   68.431005,       0.330,      8.695,    0.870,     0.0,  -0.210,   -0.660}, // 35
    {   68.960311,       0.128,      9.695,    0.850,     0.0,  -0.220,   -0.665}, // 36
    {  118.750343,      94.500,      0.009,    1.630,     0.0,  -0.031,    0.008}, // 37
    {  368.498350,       6.790,      0.049,    1.920,     0.6,   0.000,    0.000}, // 38
    {  424.763124,      63.800,      0.044,    1.926,     0.6,   0.000,    0.000}, // 39
    {  487.249370,      23.500,      0.049,    1.920,     0.6,   0.000,    0.000}, // 40
    {  715.393150,       9.960,      0.145,    1.810,     0.6,   0.000,    0.000}, // 41
    {  773.839675,      67.100,      0.130,    1.810,     0.6,   0.000,    0.000}, // 42
    {  834.145330,      18.000,      0.147,    1.810,     0.6,   0.000,    0.000}}; // 43

  // number of lines of Liebe O2-line catalog (0-43 lines)
  const Index i_first = 0;
  const Index i_last  = 43; // all the spec. lines up to 1THz
  // const Index i_last  = 37; // only the 60GHz complex + 118GHz line


  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM92 model (JQSRT, Vol 48, pp. 629-643, 1992):
  const Numeric CC_MPM92 = 1.00000;
  const Numeric CL_MPM92 = 1.00000;
  const Numeric CW_MPM92 = 1.00000;
  const Numeric CO_MPM92 = 1.00000;
  int AppCutoff = 0;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO;
  if ( model == "MPM92" )
    {
      CC = CC_MPM92;
      CL = CL_MPM92;
      CW = CW_MPM92;
      CO = CO_MPM92;
    }
  else if ( model == "MPM92Lines" )
    {
      CC = 0.000;
      CL = CL_MPM92;
      CW = CW_MPM92;
      CO = CO_MPM92;
    }
  else if ( model == "MPM92Continuum" )
    {
      CC = CC_MPM92;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "MPM92NoCoupling" )
    {
      CC = CC_MPM92;
      CL = CL_MPM92;
      CW = CW_MPM92;
      CO = 0.000;
    }
  else if ( model == "MPM92NoCutoff" )
    {
      CC = CC_MPM92;
      CL = CL_MPM92;
      CW = CW_MPM92;
      CO = CO_MPM92;
      AppCutoff = 1;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-MPM92: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM92' 'MPM92Lines' 'MPM92Continuum' 'MPM92NoCoupling' 'MPM92NoCutoff'"
         << "and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-MPM92: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;

  // O2 continuum parameters of MPM92:
  const Numeric  S0 =  6.140e-5; // line strength                        [ppm]
  const Numeric G0 =  0.560e-3; // line width                           [GHz/hPa]
  const Numeric  X0 =  0.800;    // temperature dependence of line width [1]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: MPM92 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }

      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [hPa]
      Numeric pwv       = Pa_to_hPa * abs_p[i] * abs_h2o[i];
      // dry air partial pressure [hPa]
      Numeric pda       = (Pa_to_hPa * abs_p[i]) - pwv;
      // here the total pressure is devided by the O2 vmr for the
      // P_dry calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      Numeric pda_dummy = pda;
      // O2 continuum strength [ppm]
      Numeric strength_cont =  S0 * pda_dummy * pow( theta, (Numeric)2. );
      // O2 continuum pseudo line broadening [GHz]
      Numeric gam_cont      =  G0 * (pwv+pda) *  pow( theta, X0 ); // GHz

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;
    // O2 continuum absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    Numeric Nppc =  CC * strength_cont * ff * gam_cont /
                    ( pow( ff, (Numeric)2.) + pow( gam_cont, (Numeric)2.) );

    // Loop over MPM92 O2 spectral lines:
    Numeric Nppl  = 0.0;
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]   S=A(1,I)*P*V**3*EXP(A(2,I)*(1.-V))*1.E-6
        Numeric strength = CL * 1.000e-6  * pda_dummy * mpm92[l][1] / mpm92[l][0] *
                          pow(theta, (Numeric)3.) * exp(mpm92[l][2]*(1.0-theta));
        // line broadening parameter [GHz]
        Numeric gam      = CW * ( mpm92[l][3] * 0.001 *
                                ( (       pda * pow(theta, ((Numeric)0.8-mpm92[l][4]))) +
                                        (1.10 * pwv * theta) ) );
        // line mixing parameter [1]
        //      if (l < 11) CD = 1.1000;
        Numeric delta    = CO * ( (mpm92[l][5] + mpm92[l][6] * theta) *
                    (pda+pwv) * 0.001 * pow(theta, (Numeric)0.8) );
        // absorption [dB/km] like in the original MPM92
        Nppl            += strength * MPMLineShapeO2Function(gam, mpm92[l][0], ff, delta);
      }
    // in MPM92 we adopt the cutoff for O2 line absorption if abs_l < 0
    // absorption cannot be less than 0 according to MPM87 and MPM93 source code.
    if (AppCutoff == 0)
      {
        if (Nppl < 0.000)  Nppl = 0.0000;
      }
    //
    // O2 line absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * (Nppl+Nppc) / VMRISO;
  }
    }
  return;
}
//
// #################################################################################

void MPM93O2AbsModel( MatrixView          pxsec,
          const Numeric    CCin,       // continuum scale factor
          const Numeric    CLin,       // line strength scale factor
          const Numeric    CWin,       // line broadening scale factor
          const Numeric    COin,       // line coupling scale factor
          const String&       model,
          ConstVectorView     f_grid,
          ConstVectorView     abs_p,
          ConstVectorView     abs_t,
          ConstVectorView     abs_h2o,    // VMR 0f H2O
          ConstVectorView     vmr )       // VMR of O2
{
  //
  // Coefficients are from Liebe et al., AGARD CP-May93, Paper 3/1-10
  //         0             1           2         3         4      5        6
  //         f0           a1           a2       a3        a4      a5       a6
  //        [GHz]      [kHz/hPa]      [1]    [MHz/hPa]    [1]       [10³/hPa]
  const Numeric mpm93[44][7] = {
    {   50.474238,       0.094,      9.694,    0.890,     0.0,   0.240,    0.790}, // 0
    {   50.987749,       0.246,      8.694,    0.910,     0.0,   0.220,    0.780}, // 1
    {   51.503350,       0.608,      7.744,    0.940,     0.0,   0.197,    0.774}, // 2
    {   52.021410,       1.414,      6.844,    0.970,     0.0,   0.166,    0.764}, // 3
    {   52.542394,       3.102,      6.004,    0.990,     0.0,   0.136,    0.751}, // 4
    {   53.066907,       6.410,      5.224,    1.020,     0.0,   0.131,    0.714}, // 5
    {   53.595749,      12.470,      4.484,    1.050,     0.0,   0.230,    0.584}, // 6
    {   54.130000,      22.800,      3.814,    1.070,     0.0,   0.335,    0.431}, // 7
    {   54.671159,      39.180,      3.194,    1.100,     0.0,   0.374,    0.305}, // 8
    {   55.221367,      63.160,      2.624,    1.130,     0.0,   0.258,    0.339}, // 9
    {   55.783802,      95.350,      2.119,    1.170,     0.0,  -0.166,    0.705}, // 10
    {   56.264775,      54.890,      0.015,    1.730,     0.0,   0.390,   -0.113}, // 11
    {   56.363389,     134.400,      1.660,    1.200,     0.0,  -0.297,    0.753}, // 12
    {   56.968206,     176.300,      1.260,    1.240,     0.0,  -0.416,    0.742}, // 13
    {   57.612484,     214.100,      0.915,    1.280,     0.0,  -0.613,    0.697}, // 14
    {   58.323877,     238.600,      0.626,    1.330,     0.0,  -0.205,    0.051}, // 15
    {   58.446590,     145.700,      0.084,    1.520,     0.0,   0.748,   -0.146}, // 16
    {   59.164207,     240.400,      0.391,    1.390,     0.0,  -0.722,    0.266}, // 17
    {   59.590983,     211.200,      0.212,    1.430,     0.0,   0.765,   -0.090}, // 18
    {   60.306061,     212.400,      0.212,    1.450,     0.0,  -0.705,    0.081}, // 19
    {   60.434776,     246.100,      0.391,    1.360,     0.0,   0.697,   -0.324}, // 20
    {   61.150560,     250.400,      0.626,    1.310,     0.0,   0.104,   -0.067}, // 21
    {   61.800154,     229.800,      0.915,    1.270,     0.0,   0.570,   -0.761}, // 22
    {   62.411215,     193.300,      1.260,    1.230,     0.0,   0.360,   -0.777}, // 23
    {   62.486260,     151.700,      0.083,    1.540,     0.0,  -0.498,    0.097}, // 24
    {   62.997977,     150.300,      1.665,    1.200,     0.0,   0.239,   -0.768}, // 25
    {   63.568518,     108.700,      2.115,    1.170,     0.0,   0.108,   -0.706}, // 26
    {   64.127767,      73.350,      2.620,    1.130,     0.0,  -0.311,   -0.332}, // 27
    {   64.678903,      46.350,      3.195,    1.100,     0.0,  -0.421,   -0.298}, // 28
    {   65.224071,      27.480,      3.815,    1.070,     0.0,  -0.375,   -0.423}, // 29
    {   65.764772,      15.300,      4.485,    1.050,     0.0,  -0.267,   -0.575}, // 30
    {   66.302091,       8.009,      5.225,    1.020,     0.0,  -0.168,   -0.700}, // 31
    {   66.836830,       3.946,      6.005,    0.990,     0.0,  -0.169,   -0.735}, // 32
    {   67.369598,       1.832,      6.845,    0.970,     0.0,  -0.200,   -0.744}, // 33
    {   67.900867,       0.801,      7.745,    0.940,     0.0,  -0.228,   -0.753}, // 34
    {   68.431005,       0.330,      8.695,    0.920,     0.0,  -0.240,   -0.760}, // 35
    {   68.960311,       0.128,      9.695,    0.900,     0.0,  -0.250,   -0.765}, // 36
    {  118.750343,      94.500,      0.009,    1.630,     0.0,  -0.036,    0.009}, // 37
    {  368.498350,       6.790,      0.049,    1.920,     0.6,   0.000,    0.000}, // 38
    {  424.763124,      63.800,      0.044,    1.930,     0.6,   0.000,    0.000}, // 39
    {  487.249370,      23.500,      0.049,    1.920,     0.6,   0.000,    0.000}, // 40
    {  715.393150,       9.960,      0.145,    1.810,     0.6,   0.000,    0.000}, // 41
    {  773.839675,      67.100,      0.130,    1.820,     0.6,   0.000,    0.000}, // 42
    {  834.145330,      18.000,      0.147,    1.810 ,    0.6,   0.000,    0.000}}; // 43
  // number of lines of Liebe O2-line catalog (0-43 lines)
  const Index i_first = 0;
  const Index i_last  = 43; // all the spec. lines up to 1THz
  // const Index i_last  = 37; // only the 60GHz complex + 118GHz line


  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM87 model (Radio Science, 20(5), 1985, 1069):
  const Numeric CC_MPM93 = 1.00000;
  const Numeric CL_MPM93 = 1.00000;
  const Numeric CW_MPM93 = 1.00000;
  const Numeric CO_MPM93 = 1.00000;
  int   AppCutoff = 0;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO;
  if ( model == "MPM93" )
    {
      CC = CC_MPM93;
      CL = CL_MPM93;
      CW = CW_MPM93;
      CO = CO_MPM93;
    }
  else if ( model == "MPM93Lines" )
    {
      CC = 0.000;
      CL = CL_MPM93;
      CW = CW_MPM93;
      CO = CO_MPM93;
    }
  else if ( model == "MPM93Continuum" )
    {
      CC = CC_MPM93;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "MPM93NoCoupling" )
    {
      CC = CC_MPM93;
      CL = CL_MPM93;
      CW = CW_MPM93;
      CO = 0.000;
    }
  else if ( model == "MPM93NoCutoff" )
    {
      // !!ATTENTION!!
      // In the window regions the total absorption can get negative values.
      // So be carefull with this selection!
      CC = CC_MPM93;
      CL = CL_MPM93;
      CW = CW_MPM93;
      CO = CO_MPM93;
      AppCutoff = 1;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-MPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93' 'MPM93Lines' 'MPM93Continuum' 'MPM93NoCoupling' 'MPM93NoCutoff'"
         << "and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-MPM93: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;

  // O2 continuum parameters of MPM93:
  const Numeric  S0 =  6.140e-5; // line strength                        [ppm]
  const Numeric G0 =  0.560e-3; // line width                           [GHz/hPa]
  const Numeric  X0 =  0.800;    // temperature dependence of line width [1]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature (pressure in hPa therefore the factor 0.01)
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: MPM93 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }

      // relative inverse temperature [1]
      Numeric theta     = (300.0 / abs_t[i]);
      // H2O partial pressure [hPa]
      Numeric pwv       = Pa_to_hPa * abs_p[i] * abs_h2o[i];
      // dry air partial pressure [hPa]
      Numeric pda       = (Pa_to_hPa * abs_p[i]) - pwv;
      // here the total pressure is devided by the O2 vmr for the
      // P_dry calculation because we calculate pxsec and not abs: abs = vmr * pxsec
      // old version without VMRISO: Numeric pda_dummy = pda / vmr[i];
      Numeric pda_dummy = pda;
      // O2 continuum strength [ppm]
      Numeric strength_cont =  S0 * pda_dummy * pow( theta, (Numeric)2. );
      // O2 continuum pseudo line broadening [GHz]
      Numeric gam_cont      =  G0 * (pwv+pda) *  pow( theta, X0 ); // GHz

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // input frequency in [GHz]
    Numeric ff = f_grid[s] * Hz_to_GHz;
    // O2 continuum absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    Numeric Nppc =  CC * strength_cont * ff * gam_cont /
                    ( pow( ff, (Numeric)2.)
                            + pow( gam_cont, (Numeric)2.) );

    // Loop over MPM93 O2 spectral lines:
    Numeric Nppl  = 0.0;
    for ( Index l = i_first; l <= i_last; ++l )
      {
        // line strength [ppm]   S=A(1,I)*P*V**3*EXP(A(2,I)*(1.-V))*1.E-6
        Numeric strength = CL * 1.000e-6  * pda_dummy *
                          mpm93[l][1] / mpm93[l][0] *
                          pow(theta, (Numeric)3.) * exp(mpm93[l][2]*(1.0-theta));
        // line broadening parameter [GHz]
        Numeric gam      = CW * ( mpm93[l][3] * 0.001 *
                                      ( (       pda * pow(theta, ((Numeric)0.8-mpm93[l][4]))) +
                                        (1.10 * pwv * theta) ) );
        // line mixing parameter [1]
        //      if (l < 11) CD = 1.1000;
        Numeric delta    = CO * ( (mpm93[l][5] + mpm93[l][6] * theta) *
                    (pda+pwv) * pow(theta, (Numeric)0.8)
                                        * (Numeric)0.001 );
        // absorption [dB/km] like in the original MPM93
        Nppl            += strength * MPMLineShapeO2Function(gam, mpm93[l][0], ff, delta);
      }
    // in MPM93 there is a cutoff for O2 line absorption if abs_l < 0
    // absorption cannot be less than 0 according to MPM93 philosophy.
    if (AppCutoff == 0)
      {
        if (Nppl < 0.000)  Nppl = 0.0000;// <---!!IMPORTANT FEATURE!!
      }
    //
    // O2 line absorption [1/m]
    // cross section: pxsec = absorption / var
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    pxsec(s,i) += dB_km_to_1_m * 0.1820 * ff * (Nppl+Nppc) / VMRISO;
  }
    }
  return;
}
//
// #################################################################################
//

void PWR93O2AbsModel( MatrixView        pxsec,
          const Numeric     CCin,      // model parameter
          const Numeric     CLin,      // model parameter
          const Numeric     CWin,      // model parameter
          const Numeric     COin,      // model parameter
          const String&     model,     // model selection string
          const String&     version,   // PWR98, PWR93 or PWR88
          ConstVectorView   f_grid,
          ConstVectorView   abs_p,
          ConstVectorView   abs_t,
          ConstVectorView   vmrh2o,
                      ConstVectorView   vmr )
{
  const Index n_lines = 40; // all O2 lines in this model (range: 50-850 GHz)
  //
  // lines are arranged 1-,1+,3-,3+,etc. in spin-rotation spectrum
  // line center frequency in [GHz]
  const Numeric F93[n_lines] = { 118.7503,  56.2648,  62.4863,  58.4466,   // 00-03
                60.3061,  59.5910,  59.1642,  60.4348,   // 04-07
                  58.3239,  61.1506,  57.6125,  61.8002,   // 08-11
                56.9682,  62.4112,  56.3634,  62.9980,   // 12-15
                55.7838,  63.5685,  55.2214,  64.1278,   // 16-19
                54.6712,  64.6789,  54.1300,  65.2241,   // 20-23
                53.5957,  65.7648,  53.0669,  66.3021,   // 24-27
                52.5424,  66.8368,  52.0214,  67.3696,   // 28-31
                51.5034,  67.9009, 368.4984, 424.7631,   // 32-35
               487.2494, 715.3932, 773.8397, 834.1453};  // 36-39

  // intensities in the submm range are updated according to HITRAN96
  const Numeric F98[n_lines] = { 118.7503,  56.2648,  62.4863,  58.4466,  60.3061,  59.5910,
          59.1642,  60.4348,  58.3239,  61.1506,  57.6125,  61.8002,
          56.9682,  62.4112,  56.3634,  62.9980,  55.7838,  63.5685,
                55.2214,  64.1278,  54.6712,  64.6789,  54.1300,  65.2241,
                53.5957,  65.7648,  53.0669,  66.3021,  52.5424,  66.8368,
                52.0214,  67.3696,  51.5034,  67.9009, 368.4984, 424.7632,
         487.2494, 715.3931, 773.8397, 834.1458};


  // line strength at T=300K in [cm² * Hz]
  const Numeric S93[n_lines] = { 0.2936E-14, 0.8079E-15, 0.2480E-14, 0.2228E-14,
                     0.3351E-14, 0.3292E-14, 0.3721E-14, 0.3891E-14,
               0.3640E-14, 0.4005E-14, 0.3227E-14, 0.3715E-14,
                     0.2627E-14, 0.3156E-14, 0.1982E-14, 0.2477E-14,
                     0.1391E-14, 0.1808E-14, 0.9124E-15, 0.1230E-14,
                     0.5603E-15, 0.7842E-15, 0.3228E-15, 0.4689E-15,
                     0.1748E-15, 0.2632E-15, 0.8898E-16, 0.1389E-15,
                     0.4264E-16, 0.6899E-16, 0.1924E-16, 0.3229E-16,
                     0.8191E-17, 0.1423E-16, 0.6460E-15, 0.7047E-14,
                     0.3011E-14, 0.1826E-14, 0.1152E-13, 0.3971E-14};

  // intensities in the submm range are updated according to HITRAN96
  const Numeric S98[n_lines] = { 0.2936E-14, 0.8079E-15, 0.2480E-14, 0.2228E-14,
         0.3351E-14, 0.3292E-14, 0.3721E-14, 0.3891E-14,
               0.3640E-14, 0.4005E-14, 0.3227E-14, 0.3715E-14,
               0.2627E-14, 0.3156E-14, 0.1982E-14, 0.2477E-14,
               0.1391E-14, 0.1808E-14, 0.9124E-15, 0.1230E-14,
               0.5603E-15, 0.7842E-15, 0.3228E-15, 0.4689E-15,
               0.1748E-15, 0.2632E-15, 0.8898E-16, 0.1389E-15,
               0.4264E-16, 0.6899E-16, 0.1924E-16, 0.3229E-16,
               0.8191E-17, 0.1423E-16, 0.6494E-15, 0.7083E-14,
                                 0.3025E-14, 0.1835E-14, 0.1158E-13, 0.3993E-14};

  // temperature exponent of the line strength in [1]
  const Numeric BE[n_lines] = { 0.009,   0.015,   0.083,   0.084,
        0.212,   0.212,   0.391,   0.391,
              0.626,   0.626,   0.915,   0.915,
        1.260,   1.260,   1.660,   1.665,
                                2.119,   2.115,   2.624,   2.625,
                                3.194,   3.194,   3.814,   3.814,
                                4.484,   4.484,   5.224,   5.224,
                                6.004,   6.004,   6.844,   6.844,
                                7.744,   7.744,   0.048,   0.044,
                    0.049,   0.145,   0.141,   0.145};

  // widths in MHz/mbar for the O2 continuum
  const Numeric WB300 = 0.56; // [MHz/mbar]=[MHz/hPa]
  const Numeric X     = 0.80; // [1]

  // line width parameter [GHz/bar]
  const Numeric W300[n_lines] = {   1.630, 1.646, 1.468, 1.449,
            1.382, 1.360, 1.319, 1.297,
            1.266, 1.248, 1.221, 1.207,
            1.181, 1.171, 1.144, 1.139,
            1.110, 1.108, 1.079, 1.078,
            1.050, 1.050, 1.020, 1.020,
            1.000, 1.000, 0.970, 0.970,
            0.940, 0.940, 0.920, 0.920,
            0.890, 0.890, 1.920, 1.920,
            1.920, 1.810, 1.810, 1.810};

  // y parameter for the calculation of Y [1/bar]
  const Numeric Y93[n_lines] = { -0.0233,  0.2408, -0.3486,  0.5227,
               -0.5430,  0.5877, -0.3970,  0.3237,
                                 -0.1348,  0.0311,  0.0725, -0.1663,
                                  0.2832, -0.3629,  0.3970, -0.4599,
                                  0.4695, -0.5199,  0.5187, -0.5597,
                                  0.5903, -0.6246,  0.6656, -0.6942,
                                  0.7086, -0.7325,  0.7348, -0.7546,
                                  0.7702, -0.7864,  0.8083, -0.8210,
                                  0.8439, -0.8529,  0.0000,  0.0000,
                                  0.0000,  0.0000,  0.0000,  0.0000};

  // y parameter for the calculation of Y [1/bar].
  // These values are from P. W. Rosenkranz, Interference coefficients for the
  // overlapping oxygen lines in air, JQSRT, 1988, Volume 39, 287-297.
  const Numeric Y88[n_lines] = { -0.0244,  0.2772, -0.4068,  0.6270,
                                 -0.6183,  0.6766, -0.4119,  0.3290,
                                  0.0317, -0.1591,  0.1145, -0.2068,
                                  0.3398, -0.4158,  0.3922, -0.4482,
                                  0.4011, -0.4442,  0.4339, -0.4687,
                                  0.4783, -0.5074,  0.5157, -0.5403,
                                  0.5400, -0.5610,  0.5719, -0.5896,
                                  0.6046, -0.6194,  0.6347, -0.6468,
                                  0.6627, -0.6718,  0.0000,  0.0000,
                                  0.0000,  0.0000,  0.0000,  0.0000};

  // v parameter for the calculation of Y [1/bar]
  const Numeric V[n_lines] ={    0.0079, -0.0978,  0.0844, -0.1273,
         0.0699, -0.0776,  0.2309, -0.2825,
         0.0436, -0.0584,  0.6056, -0.6619,
         0.6451, -0.6759,  0.6547, -0.6675,
         0.6135, -0.6139,  0.2952, -0.2895,
         0.2654, -0.2590,  0.3750, -0.3680,
         0.5085, -0.5002,  0.6206, -0.6091,
         0.6526, -0.6393,  0.6640, -0.6475,
         0.6729, -0.6545,  0.0000,  0.0000,
         0.0000,  0.0000,  0.0000,  0.0000};
  // range of lines to take into account for the line absorption part
  const Index first_line = 0;  // first line for calculation
  const Index last_line  = 39; // last line for calculation

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Rosenkranz model
  // (P. W. Rosenkranz, Chapter 2, pp 74, in M. A. Janssen,
  // "Atmospheric Remote Sensing by Microwave Radiometry", John Wiley & Sons, Inc., 1993):
  const Numeric CC_PWR93 = 1.00000;
  const Numeric CL_PWR93 = 1.00000;
  const Numeric CW_PWR93 = 1.00000;
  const Numeric CO_PWR93 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CL, CW, CO, Y300[n_lines], S300[n_lines], F[n_lines];
  // FIXME int oldnewflag = 0;

  if ( model == "Rosenkranz" )
    {
      CC = CC_PWR93;
      CL = CL_PWR93;
      CW = CW_PWR93;
      CO = CO_PWR93;
    }
  else if ( model == "RosenkranzLines" )
    {
      CC = 0.000;
      CL = CL_PWR93;
      CW = CW_PWR93;
      CO = CO_PWR93;
    }
  else if ( model == "RosenkranzContinuum" )
    {
      CC = CC_PWR93;
      CL = 0.000;
      CW = 0.000;
      CO = 0.000;
    }
  else if ( model == "RosenkranzNoCoupling" )
    {
      CC = CC_PWR93;
      CL = CL_PWR93;
      CW = CW_PWR93;
      CO = 0.000;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CL = CLin;
      CW = CWin;
      CO = COin;
    }
  else
    {
      ostringstream os;
      os << "O2-PWR93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'Rosenkranz', 'RosenkranzLines', RosenkranzContinuum, "
         << "'RosenkranzNoCoupling', and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-PWR93: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CL = " << CL << "\n"
  << " CW = " << CW << "\n"
  << " CO = " << CO << "\n";


  // determin if version Rosenkranz 1993 or Rosenkranz 1988 is selected
  if ( (version != "PWR98") && (version != "PWR93") && (version != "PWR88") )
    {
      ostringstream os;
      os << "O2-PWR93/PWR88: ERROR! Wrong version is selected.\n"
   << "Valid versions are:\n"
   << "  'PWR98'  updates of F and S to HISTRAN96 and M.J.Schwartz, MIT, 1997\n"
         << "           suggestions implemented.\n"
         << "  'PWR93'  for the oxygen absorption model described in  \n"
         << "           P. W. Rosenkranz, Chapter 2, in M. A. Janssen,\n"
         << "           Atmospheric Remote Sensing by Microwave Radiometry,\n"
         << "           John Wiley & Sons, Inc., 1993.\n"
         << "  'PWR88'  for the oxygen absorption model described in \n"
         << "           P. W. Rosenkranz, Interference coefficients for the \n"
   << "           overlapping oxygen lines in air, \n"
         << "           JQSRT, 1988, Volume 39, 287-297.\n";
      throw runtime_error(os.str());
    }


  // select version dependent parameters
  if ( version == "PWR88" ) {
    for ( Index i=0; i<n_lines; ++i )
      {
  F[i]    = F93[i];
  S300[i] = S93[i];
        Y300[i] = Y88[i];
      };
  }
  if ( version == "PWR93" ) {
    for ( Index i=0; i<n_lines; ++i )
      {
  F[i]    = F93[i];
        S300[i] = S93[i];
        Y300[i] = Y93[i];
      };
  }
  if ( version == "PWR98" ) {
    for ( Index i=0; i<n_lines; ++i )
      {
  F[i]    = F98[i];
  S300[i] = S98[i];
        Y300[i] = Y93[i];
      };
  }

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // check if O2-VMR will cause an underflow due to division by zero:
      if (vmr[i] < VMRCalcLimit)
  {
    ostringstream os;
    os << "ERROR: PWR93 O2 full absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }
      // relative inverse temperature [1]
      Numeric TH     = 3.0000e2 / abs_t[i];
      Numeric TH1    = (TH-1.000e0);
      Numeric B      = pow(TH, X);
      // partial pressure of H2O and dry air [hPa]
      Numeric PRESWV = Pa_to_hPa * (abs_p[i] * vmrh2o[i]);
      Numeric PRESDA = Pa_to_hPa * (abs_p[i] * (1.000e0 - vmrh2o[i]));
      Numeric DEN    = 0.001*(PRESDA*B + 1.1*PRESWV*TH); // [hPa]
      Numeric DENS   = 0.001*(PRESDA   + 1.1*PRESWV)*TH; // [hPa]
      Numeric DFNR   = WB300*DEN; // [GHz]

      // continuum absorption [1/m/GHz]
      Numeric CCONT  = CC * 1.23e-10 * pow( TH, (Numeric)2. ) * abs_p[i];

      // Loop over input frequency
      for ( Index s=0; s<n_f; ++s )
  {
    // initial O2 line absorption at position ff
    // Numeric O2ABS  = 0.000e0;cd safff

    // input frequency in [GHz]
    Numeric ff   = Hz_to_GHz * f_grid[s];

    // continuum absorption [Neper/km]
    Numeric CONT = CCONT * (ff * ff * DFNR / (ff*ff + DFNR*DFNR));

    // Loop over Rosnekranz '93 spectral line frequency:
    Numeric SUM  = 0.000e0;
    for ( Index l=first_line; l<=last_line; ++l )
      {
        Numeric DF = CW * W300[l] * DEN; // [hPa]
        // 118 line update according to M. J. Schwartz, MIT, 1997
        if ( (version == "PWR98") && (fabs((F[l]-118.75)) < 0.10) )
    {
      DF = CW * W300[l] * DENS; // [hPa]
    }
        Numeric Y    = CO * 0.001 * 0.01 * abs_p[i] * B * ( Y300[l] + V[l]*TH1 );
        Numeric STR  = CL * S300[l] * exp(-BE[l] * TH1);
        Numeric SF1  = ( DF + (ff-F[l])*Y ) / ( (ff-F[l])*(ff-F[l]) + DF*DF );
        Numeric SF2  = ( DF - (ff+F[l])*Y ) / ( (ff+F[l])*(ff+F[l]) + DF*DF );
        SUM         += STR * (SF1+SF2) * (ff/F[l]) * (ff/F[l]);
      }
    // O2 absorption [Neper/km]
    // Rosenkranz uses the factor 0.5034e12 in the calculation of the abs coeff.
    // This factor is the product of several terms:
          // 0.5034e12 = ISORATIO *   VMR   * (Hz/GHz) * (k_B*300K)^-1
          //           = 0.995262 * 0.20946 *   10^-9  * 2.414322e21(hPa*cm^2*km)^-1
    //             |---- 0.2085 ----|   |---- 2.414322e12(hPa*cm^2*km)^-1 ---|
    //             |---- 0.2085 ----|   |---- 2.414322e10( Pa*cm^2*km)^-1 ---|
    // O2ABS = 2.4143e12 * SUM * PRESDA * pow(TH, 3.0) / PI;
    // O2ABS = CONT + (2.414322e10 * SUM * abs_p[i] * pow(TH, 3.0) / PI);
    // unit conversion x Nepers/km = y 1/m  --->  y = x * 1.000e-3
    // therefore 2.414322e10 --> 2.414322e7
    // pxsec [1/m]
    pxsec(s,i) += CONT + (2.414322e7 * SUM * abs_p[i] * pow(TH, (Numeric)3.) / PI);
  }
    }
  return;
}
//
// #################################################################################
//

void MPM93_O2_continuum( MatrixView          pxsec,
       const Numeric       S0in,         // model parameter
       const Numeric       G0in,         // model parameter
       const Numeric       XS0in,        // model parameter
       const Numeric       XG0in,        // model parameter
       const String&       model,
       ConstVectorView     f_grid,
       ConstVectorView     abs_p,
       ConstVectorView     abs_t,
       ConstVectorView     abs_h2o,
       ConstVectorView     vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21):
  // const Numeric  S0_MPM93  =  6.140e-13/0.20946; // line strength/VMR-O2 [1/Pa]
  const Numeric  S0_MPM93  =  6.140e-13;         // line strength [1/Pa]
  const Numeric G0_MPM93  =  0.560e4;           // line width [Hz/Pa]
  const Numeric  XS0_MPM93 =  2.000;             // temperature dependence of line strength
  const Numeric  XG0_MPM93 =  0.800;             // temperature dependence of line width
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates parameters!!):
  Numeric S0, G0, XS0, XG0;
  if ( model == "MPM93" )
    {
      S0  = S0_MPM93;
      G0  = G0_MPM93;
      XS0 = XS0_MPM93;
      XG0 = XG0_MPM93;
    }
  else if ( model == "user" )
    {
      S0  = S0in;
      G0  = G0in;
      XS0 = XS0in;
      XG0 = XG0in;
    }
  else
    {
      ostringstream os;
      os << "O2-SelfContMPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-SelfContMPM93: (model=" << model << ") parameter values in use:\n"
  << " S0  = " << S0 <<  "\n"
  << " G0  = " << G0 <<  "\n"
  << " XS0 = " << XS0 << "\n"
  << " XG0 = " << XG0 << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  const Numeric  VMRISO = 0.2085;


  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      if (vmr[i] < VMRCalcLimit) // make sure that division by zero is excluded
  {
    ostringstream os;
    os << "ERROR: MPM93 O2 continuum absorption model has detected a O2 volume mixing ratio of "
       << vmr[i] << " which is below the threshold of " << VMRCalcLimit << ".\n"
       << "Therefore no calculation is performed.\n";
    throw runtime_error(os.str());
    return;
  }
      Numeric th       = 300.0 / abs_t[i]; // Theta
      // continuum strength
      Numeric strength =  S0 * abs_p[i] * (1.0000 - abs_h2o[i]) * pow( th, XS0 );
      // G0 from the input has to be converted to unit GHz/hPa --> * 1.0e-7
      Numeric gamma    =  G0 * abs_p[i] * pow( th, XG0 ); // Hz

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    // the vmr of O2 will be multiplied at the stage of absorption calculation:
    // abs / vmr * pxsec.
    pxsec(s,i) +=  (4.0 * PI / SPEED_OF_LIGHT)  *              // unit factor [1/(m*Hz)]
                  (strength / VMRISO)          *              // strength    [1]
                  ( pow( f_grid[s], (Numeric)2.) * gamma /              // line shape  [Hz]
                    ( pow( f_grid[s], (Numeric)2.) + pow( gamma, (Numeric)2.) ) );
  }
    }
  return;
}
//
// #################################################################################
//

void Rosenkranz_O2_continuum( MatrixView        pxsec,
            const Numeric     S0in,         // model parameter
            const Numeric     G0in,         // model parameter
            const Numeric     XS0in,        // model parameter
            const Numeric     XG0in,        // model parameter
            const String&     model,
            ConstVectorView    f_grid,
            ConstVectorView    abs_p,        // total pressure [Pa]
            ConstVectorView    abs_t,
            ConstVectorView   abs_h2o,      // H2O VMR
            ConstVectorView   vmr _U_ )    // O2 VMR
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // P. W. Rosenkranz, Chapter 2, in M. A. Janssen,
  // Atmospheric Remote Sensing by Microwave Radiometry, John Wiley & Sons, Inc., 1993
  // ftp://mesa.mit.edu/phil/lbl_rt
  const Numeric  S0_PWR93   =  1.11e-14; // [K²/(Hz*Pa*m)] line strength
  const Numeric G0_PWR93  =  5600.000;  // line width [Hz/Pa]
  const Numeric  XS0_PWR93 =  2.000;    // temperature dependence of line strength
  const Numeric  XG0_PWR93 =  0.800;    // temperature dependence of line width
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric S0, G0, XS0, XG0;
  if ( model == "Rosenkranz" )
    {
      S0  = S0_PWR93;
      G0  = G0_PWR93;
      XS0 = XS0_PWR93;
      XG0 = XG0_PWR93;
    }
  else if ( model == "user" )
    {
      S0  = S0in;
      G0  = G0in;
      XS0 = XS0in;
      XG0 = XG0in;
    }
  else
    {
      ostringstream os;
      os << "O2-SelfContPWR93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'Rosenkranz' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-SelfContPWR93: (model=" << model << ") parameter values in use:\n"
  << " S0  = " << S0 <<  "\n"
  << " G0  = " << G0 <<  "\n"
  << " XS0 = " << XS0 << "\n"
  << " XG0 = " << XG0 << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // loop over all pressure levels:
  for ( Index i=0; i<n_p; ++i )
    {
      Numeric TH = 300.00 / abs_t[i];         // relative temperature  [1]

      Numeric ph2o  = abs_p[i] * abs_h2o[i];  // water vapor partial pressure [Pa]
      Numeric pdry  = abs_p[i] - ph2o;        // dry air partial pressure     [Pa]


      // pseudo broadening term [Hz]
      Numeric gamma = G0 * (pdry * pow( TH, XG0 ) + 1.100 * ph2o * TH);

      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    // division by vmr of O2 is necessary because of the absorption calculation
          // abs = vmr * pxsec.
    pxsec(s,i) += S0 * abs_p[i] / pow( abs_t[i], XS0 ) *
                        ( pow( f_grid[s], (Numeric)2. )
                          * gamma / ( pow( f_grid[s], 2 )
                                      + pow( gamma, (Numeric)2. ) ) ) ;
  }
    }
}
//
//
// #################################################################################

void Standard_O2_continuum( MatrixView        pxsec,         // cross section
          const Numeric     Cin,          // model parameter
          const Numeric     G0in,         // model parameter
          const Numeric     G0Ain,        // model parameter
          const Numeric     G0Bin,        // model parameter
          const Numeric     XG0din,       // model parameter
          const Numeric     XG0win,       // model parameter
          const String&     model,        // model parameter
          ConstVectorView   f_grid,       // frequency grid
          ConstVectorView   abs_p,        // P_tot grid
          ConstVectorView   abs_t,        // T grid
          ConstVectorView   abs_h2o,      // VMR H2O profile
          ConstVectorView   vmr _U_ )   // VMR O2  profile
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // P. W. Rosenkranz, Chapter 2, in M. A. Janssen,
  // Atmospheric Remote Sensing by Microwave Radiometry, John Wiley & Sons, Inc., 1993
  // ftp://mesa.mit.edu/phil/lbl_rt
  const Numeric  C_PWR93    = (1.108e-14/pow((Numeric)3.0e2,(Numeric)2.)); // [1/(Hz*Pa*m)] line strength
  const Numeric G0_PWR93   = 5600.000;  // line width [Hz/Pa]
  const Numeric G0A_PWR93  =    1.000;  // line width [1]
  const Numeric G0B_PWR93  =    1.100;  // line width [1]
  const Numeric  XG0d_PWR93 =    0.800;  // temperature dependence of line width [1]
  const Numeric  XG0w_PWR93 =    1.000;  // temperature dependence of line width [1]
  //
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21):
  // const Numeric  C_MPM93    = 1.23e-19; // line strength/VMR [1/m*1/Hz*1/Pa]
  const Numeric  C_MPM93    = 6.14e-13*(4.0*PI/SPEED_OF_LIGHT)/0.2085; // line strength [1/m*1/Hz*1/Pa]
  // 0.2085 = VMR * ISORATIO = 0.20946 * 0.99519
  const Numeric G0_MPM93   = 5600.000; // line width [Hz/Pa]
  const Numeric G0A_MPM93  =    1.000; // line width [1]
  const Numeric G0B_MPM93  =    1.000; // line width [1]
  const Numeric  XG0d_MPM93 =    0.800; // temperature dependence of line strength [1]
  const Numeric  XG0w_MPM93 =    0.800; // temperature dependence of line width    [1]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric C, G0, G0A, G0B, XG0d, XG0w;
  if ( model == "Rosenkranz" )
    {
      C    = C_PWR93;
      G0   = G0_PWR93;
      G0A  = G0A_PWR93;
      G0B  = G0B_PWR93;
      XG0d = XG0d_PWR93;
      XG0w = XG0w_PWR93;
    }
  else if ( model == "MPM93" )
    {
      C    = C_MPM93;
      G0   = G0_MPM93;
      G0A  = G0A_MPM93;
      G0B  = G0B_MPM93;
      XG0d = XG0d_MPM93;
      XG0w = XG0w_MPM93;
    }
  else if ( model == "user" )
    {
      C    = Cin;
      G0   = G0in;
      G0A  = G0Ain;
      G0B  = G0Bin;
      XG0d = XG0din;
      XG0w = XG0win;
    }
  else
    {
      ostringstream os;
      os << "O2-GenerealCont: ERROR! Wrong model values given.\n"
   << "Valid models are: 'Rosenkranz', 'MPM93' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "O2-GeneralCont: (model=" << model << ") parameter values in use:\n"
  << " C    = " << C <<  "\n"
  << " G0   = " << G0 <<  "\n"
  << " G0A  = " << G0A <<  "\n"
  << " G0B  = " << G0B <<  "\n"
  << " XG0d = " << XG0d << "\n"
  << " XG0w = " << XG0w << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // const = VMR * ISORATIO = 0.20946 * 0.99519
  // this constant is already incorporated into the line strength, so we
  // have top devide the line strength by this value since arts multiplies pxsec
  // by these variables later in abs_coefCalc.
  // FIXME const Numeric  VMRISO = 0.2085;

  // loop over all pressure levels:
  for ( Index i=0; i<n_p; ++i )
    {
      Numeric TH = 3.0e2 / abs_t[i];         // relative temperature  [1]

      Numeric ph2o = abs_p[i] * abs_h2o[i];  // water vapor partial pressure [Pa]
      Numeric pdry = abs_p[i] - ph2o;        // dry air partial pressure     [Pa]


      // pseudo broadening term [Hz]
      Numeric gamma = G0 * (G0A * pdry * pow( TH, XG0d ) + G0B * ph2o * pow( TH, XG0w ));

      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    // division by vmr of O2 is necessary because of the absorption calculation
          // abs = vmr * pxsec.
    pxsec(s,i) += C * abs_p[i] * pow( TH, (Numeric)2. ) *
                       ( gamma * pow( f_grid[s], (Numeric)2. ) /
                         ( pow( f_grid[s], 2 ) + pow( gamma, (Numeric)2. ) ) );
  }
    }
}
//
// #################################################################################
// ################################ NITROGEN MODELS ################################
// #################################################################################
//

void BF86_CIA_N2( MatrixView          pxsec,
      const Numeric       Cin,
      const String&       model,
      ConstVectorView     f_grid,
      ConstVectorView     abs_p,
      ConstVectorView     abs_t,
      ConstVectorView     vmr   )
{
  //
  //
  // external function to call (original F77 code translated with f2c)
  extern Numeric n2n2tks_(double t, double f);
  //
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 H2O continuum model
  // (AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21):
  Numeric  XFAC  =  1.0000;             // scaling factor
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  if ( model == "BF86" )
    {
      XFAC =  1.0000;
    }
  else if ( model == "user" )
    {
      XFAC =  Cin;
    }
  else
    {
      ostringstream os;
      os << "N2-SelfContBorysow: ERROR! Wrong model values given.\n"
   << "allowed models are: 'BF86', 'user'" << '\n';
      throw runtime_error(os.str());
    }

  out3  << "N2-SelfContBorysow: (model=" << model << ") parameter values in use:\n"
  << " XFAC = " << XFAC << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies


  const Numeric AMAG2DEN = 44.53807; // inverse of N2 mol volume at std p/T
  const Numeric RIDGAS =  8.314510;  // ideal gas constant

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      //cout << "------------------------------------------------\n";
      double T = (double) abs_t[i];
      //cout << "N2-N2 BF86: T     =" << T << " K\n";
      //cout << "N2-N2 BF86: p     =" << abs_p[i] << " Pa\n";
      //cout << "N2-N2 BF86: VMR   =" << vmr[i] << "\n";
      Numeric XAMA  = (abs_p[i]) / ( AMAG2DEN * RIDGAS * abs_t[i] );
      Numeric XAMA2 = pow(XAMA,(Numeric)2.);
      //cout << "N2-N2 BF86: XAMA  =" << XAMA << "\n";

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    // the second vmr of N2 will be multiplied at the stage of
    // absorption calculation: abs =  vmr * pxsec.
    double f = (double) f_grid[s];
    //cout << "N2-N2 BF86: f     =" << f << " Hz\n";
    double cont = n2n2tks_(T, f);
    pxsec(s,i) += (Numeric) (cont * 1.000e2 * vmr[i] * XAMA2);
    //cout << "N2-N2 BF86: cont  =" << cont << " cm-1 * amagat-2\n";
    //cout << "N2-N2 BF86: abs   =" << (vmr[i] * pxsec(s,i)) << " m-1\n";
  }
    }
  return;
}
//
// #################################################################################
//

void MPM93_N2_continuum( MatrixView          pxsec,
       const Numeric       Cin,
       const Numeric       Gin,
       const Numeric       xTin,
       const Numeric       xfin,
       const String&       model,
       ConstVectorView     f_grid,
       ConstVectorView     abs_p,
       ConstVectorView     abs_t,
       ConstVectorView     abs_h2o,
       ConstVectorView     vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 H2O continuum model
  // (AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21):
  const Numeric  xT_MPM93  =  3.500;             // temperature exponent [1]
  const Numeric  xf_MPM93  =  1.500;             // frequency exponent [1]
  const Numeric  gxf_MPM93 =  9.000*xf_MPM93;    // needed for the unit conversion of G_MPM93
  const Numeric  S_MPM93   =  2.296e-31;         // line strength  [1/Pa² * 1/Hz]
  const Numeric G_MPM93   =  1.930e-5*pow((Numeric)10.000, -gxf_MPM93); // frequency factor [1/Hz^xf]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric S0, G0, xf, xT, gxf;
  if ( model == "MPM93" )
    {
      S0  = S_MPM93;
      G0  = G_MPM93;
      xT  = xT_MPM93;
      xf  = xf_MPM93;
      gxf = gxf_MPM93;
    }
  else if ( model == "MPM93Scale" )
    {
      S0  = Cin * S_MPM93;
      G0  = G_MPM93;
      xT  = xT_MPM93;
      xf  = xf_MPM93;
      gxf = gxf_MPM93;
    }
  else if ( model == "user" )
    {
      S0  = Cin;
      G0  = Gin;
      xT  = xTin;
      xf  = xfin;
      gxf = 9.000*xf;
    }
  else
    {
      ostringstream os;
      os << "N2-SelfContMPM93 : ERROR! Wrong model values given.\n"
   << "allowed models are: 'MPM93', 'MPM93Scale' or 'user'" << '\n';
      throw runtime_error(os.str());
    }

  out3  << "N2-SelfContMPM93: (model=" << model << ") parameter values in use:\n"
  << " S0 = " << S0 << "\n"
  << " G0 = " << G0 << "\n"
  << " xT = " << xT << "\n"
  << " xf = " << xf << "\n";

  // unit conversion internally:
  //const Numeric S0unitconv = 1.000e+13;  // x [1/(hPa²*GHz)] => y [1/(pa²*Hz)]
  //const Numeric G0unitconv = pow(10.000, gxf);

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  Numeric fac = 4.0 * PI / SPEED_OF_LIGHT;  //  = 4 * pi / c
  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      Numeric th = 300.0 / abs_t[i];
      Numeric strength =  S0 *
                          pow( (abs_p[i] * ((Numeric)1.0000 - abs_h2o[i])),
                               (Numeric)2. )
                          * pow( th, xT );

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    // FIXME Numeric f = f_grid[s] * Hz_to_GHz; // frequency in GHz
    // the vmr of N2 will be multiplied at the stage of absorption calculation:
    // abs / vmr * pxsec.
    pxsec(s,i) += fac * strength *                              // strength
                       pow(f_grid[s], (Numeric)2.) /                      // frequency dependence
                 ( 1.000 + G0 * pow( f_grid[s], xf) ) *
                  vmr[i];                                // N2 vmr
  }
    }
  return;
}
//
// #################################################################################

void Pardo_ATM_N2_dry_continuum( MatrixView          pxsec,
         const Numeric       Cin,
         const String&       model,
         ConstVectorView     f_grid,
         ConstVectorView     abs_p,
         ConstVectorView     abs_t,
         ConstVectorView     vmr,
         ConstVectorView     h2ovmr   )
{
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Pardo et al. model (IEEE, Trans. Ant. Prop.,
  // Vol 49, No 12, pp. 1683-1694, 2001)
  const Numeric  C_ATM = 2.612e-6; // [1/m]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates parameters!!):
  Numeric C;
   if ( model == "ATM" )
     {
       C = C_ATM;
     }
   else if ( model == "user" )
     {
       C = Cin;
     }
   else
     {
       ostringstream os;
       os << "N2-DryContATM01: ERROR! Wrong model values given.\n"
    << "allowed models are: 'ATM', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "N2-DryContATM01: (model=" << model << ") parameter values in use:\n"
         << " C_s = " << C << "\n";

   const Index n_p = abs_p.nelem();  // Number of pressure levels
   const Index n_f = f_grid.nelem();  // Number of frequencies

   // Check that dimensions of abs_p, abs_t, and vmr agree:
   assert ( n_p==abs_t.nelem() );
   assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      // since this is an effective "dry air" continuum, it is not really
      // it is not specifically attributed to N2, so we need the total
      // dry air part in total which is equal to the total minus the
      // water vapor pressure:
      Numeric  pd = abs_p[i] * ( 1.00000e0 - h2ovmr[i] ); // [Pa]
      // Loop over frequency grid:
      if (vmr[i] > VMRCalcLimit )
  {
    for ( Index s=0; s<n_f; ++s )
      {
        // Becaue this is an effective "dry air" continuum, it is not really
        // specific N2 but mainly caused by N2. Therefore the N2 vmr must be
        // canceled out here which is later in abs_coefCalc multiplied
        // (calculation: abs = vmr * pxsec):
        pxsec(s,i) += C *                    // strength [1/(m*Hz²Pa²)]
    pow( (f_grid[s]/(Numeric)2.25e11), (Numeric)2. ) * // quadratic f dependence [Hz²]
    pow( ((Numeric)300.0/abs_t[i]), (Numeric)3.5 )   * // free T dependence      [1]
    pow( (pd/(Numeric)1.01300e5), (Numeric)2. )      / // quadratic p dependence [Pa²]
    vmr[i];                                            // cancel the vmr dependency
      }
  }
    }
}
//
// #################################################################################

void Rosenkranz_N2_self_continuum( MatrixView          pxsec,
           const Numeric       Cin,
           const Numeric       xin,
           const String&       model,
           ConstVectorView     f_grid,
           ConstVectorView     abs_p,
           ConstVectorView     abs_t,
           ConstVectorView     vmr   )
{
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Rosenkranz model (Chapter 2, pp 74, in M. A. Janssen,
  // "Atmospheric Remote Sensing by Microwave Radiometry", John Wiley & Sons, Inc., 1993
  const Numeric  C_PWR = 1.05e-38; // [1/(Pa²*Hz²*m)]
  const Numeric  x_PWR = 3.55;     // [1]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates parameters!!):
  Numeric C, x;
   if ( model == "Rosenkranz" )
     {
       C = C_PWR;
       x = x_PWR;
     }
   else if ( model == "user" )
     {
       C = Cin;
       x = xin;
     }
   else
     {
       ostringstream os;
       os << "N2-SelfContPWR93: ERROR! Wrong model values given.\n"
    << "allowed models are: 'Rosenkranz', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "N2-SelfContPWR93: (model=" << model << ") parameter values in use:\n"
         << " C_s = " << C << "\n"
         << " x_s = " << x << "\n";

   const Index n_p = abs_p.nelem();  // Number of pressure levels
   const Index n_f = f_grid.nelem();  // Number of frequencies

   // Check that dimensions of abs_p, abs_t, and vmr agree:
   assert ( n_p==abs_t.nelem() );
   assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    // The second vmr of N2 will be multiplied at the stage of absorption
    // calculation: abs = vmr * pxsec.
    pxsec(s,i) += C *                        // strength [1/(m*Hz²Pa²)]
                 pow( f_grid[s], (Numeric)2. ) *      // quadratic f dependence [Hz²]
                 pow( (Numeric)300.0/abs_t[i], x ) * // free T dependence      [1]
                       pow( abs_p[i], (Numeric)2. ) *       // quadratic p dependence [Pa²]
                       vmr[i];                    // second N2-VMR at the stage
                                            // of absorption calculation
  }
    }
}
//
// #################################################################################
//

void Standard_N2_self_continuum( MatrixView          pxsec,
         const Numeric       Cin,
         const Numeric       xfin,
         const Numeric       xtin,
         const Numeric       xpin,
         const String&       model,
         ConstVectorView     f_grid,
         ConstVectorView     abs_p,
         ConstVectorView     abs_t,
         ConstVectorView     vmr   )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the Rosenkranz model, Chapter 2, pp 74, in M. A. Janssen,
  // "Atmospheric Remote Sensing by Microwave Radiometry", John Wiley & Sons, Inc., 1993
  const Numeric  C_GM  = 1.05e-38; // [1/(Pa²*Hz²*m)]
  const Numeric  xf_GM = 2.00;     // [1]
  const Numeric  xt_GM = 3.55;     // [1]
  const Numeric  xp_GM = 2.00;     // [1]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates over values!!):
  Numeric C, xt, xf, xp;
   if ( model == "Rosenkranz" )
     {
       C  = C_GM;
       xt = xt_GM;
       xf = xf_GM;
       xp = xp_GM;
     }
   else if ( model == "user" )
     {
       C  = Cin;
       xt = xtin;
       xf = xfin;
       xp = xpin;
     }
   else
     {
       ostringstream os;
       os << "N2-SelfContStandardType: ERROR! Wrong model values given.\n"
    << "allowed models are: 'Rosenkranz', 'user'" << '\n';
       throw runtime_error(os.str());
     }
   out3  << "N2-SelfContStandardType: (model=" << model << ") parameter values in use:\n"
         << " C  = " << C  << "\n"
         << " xt = " << xt << "\n"
         << " xf = " << xf << "\n"
         << " xp = " << xp << "\n";


  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      //cout << "vmr[" << i << "]= " << vmr[i] << "\n";
      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    // The second N2-VMR will be multiplied at the stage of absorption
    // calculation: abs = vmr * pxsec.
    pxsec(s,i) += C                            * // strength [1/(m*Hz²Pa²)]
                       pow( ((Numeric)300.00/abs_t[i]), xt ) * // T dependence        [1]
                       pow( f_grid[s], xf )         * // f dependence    [Hz^xt]
                       pow( abs_p[i], xp )          * // p dependence    [Pa^xp]
                       pow( vmr[i], (xp-(Numeric)1.) );         // last N2-VMR at the stage
                                                // of absorption calculation
  }
    }
}
//
// #################################################################################
// ############################## CARBON DIOXIDE MODELS ############################
// #################################################################################

void Rosenkranz_CO2_self_continuum( MatrixView          pxsec,
            const Numeric       Cin,
            const Numeric       xin,
            const String&       model,
            ConstVectorView     f_grid,
            ConstVectorView     abs_p,
            ConstVectorView     abs_t,
            ConstVectorView     vmr   )
{
  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
  // "Atmospheric Remote Sensing by Microwave Radiometry", John Wiley & Sons, Inc., 1993
  const Numeric  C_PWR = 7.43e-37; // [ 1/(Pa²*Hz²*m) ]
  const Numeric  x_PWR = 5.08;     // [ 1 ]
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric C, x;
  if ( model == "Rosenkranz" )
    {
      C = C_PWR;
      x = x_PWR;
    }
  else if ( model == "user" )
    {
      C = Cin;
      x = xin;
    }
  else
    {
      ostringstream os;
      os << "CO2-SelfContPWR93 : ERROR! Wrong model values given.\n"
   << "allowed models are: 'Rosenkranz', 'user'" << "\n";
      throw runtime_error(os.str());
    }

  out3  << "CO2-SelfContPWR93: (model=" << model << ") parameter values in use:\n"
  << " C = " << C << "\n"
  << " x = " << x << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop over pressure/temperature grid:
  for ( Index i=0; i<n_p; ++i )
    {
      // Dummy scalar holds everything except the quadratic frequency dependence.
      // The second vmr of CO2 will be multiplied at the stage of absorption
      // calculation: abs = vmr * pxsec.
      Numeric dummy =
  C * pow( (Numeric)300./abs_t[i], x ) * pow( abs_p[i], (Numeric)2. ) * vmr[i];

      // Loop over frequency grid:
      for ( Index s=0; s<n_f; ++s )
  {
    pxsec(s,i) += dummy * pow( f_grid[s], (Numeric)2. );
  }
    }
}
//
// #################################################################################

void Rosenkranz_CO2_foreign_continuum( MatrixView          pxsec,
               const Numeric       Cin,
               const Numeric       xin,
               const String&       model,
               ConstVectorView     f_grid,
               ConstVectorView     abs_p,
               ConstVectorView     abs_t,
               ConstVectorView     abs_n2,
               ConstVectorView     vmr _U_ )
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // "Atmospheric Remote Sensing by Microwave Radiometry", John Wiley & Sons, Inc., 1993
  const Numeric C_PWR = 2.71e-37; // default: 2.71*10^-37 1/(Pa²*Hz²*m)
  const Numeric x_PWR = 4.7;      // default: 4.7
  // ---------------------------------------------------------------------------------------

  // select the parameter set (!!model dominates values!!):
  Numeric C, x;
  if ( model == "Rosenkranz" )
    {
      C = C_PWR;
      x = x_PWR;
    }
  else if ( model == "user" )
    {
      C = Cin;
      x = xin;
    }
  else
    {
      ostringstream os;
      os << "CO2-ForeignContPWR93: ERROR! Wrong model values given.\n"
   << "allowed models are: 'Rosenkranz', 'user'" << "\n";
      throw runtime_error(os.str());
    }

  out3  << "CO2-ForeignContPWR93: (model=" << model << ") parameter values in use:\n"
  << " C = " << C << "\n"
  << " x = " << x << "\n";

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // Dummy scalar holds everything except the quadratic frequency dependence.
      // The vmr of CO2 will be multiplied at the stage of absorption
      // calculation: abs = vmr * pxsec.
      Numeric dummy = C * pow( (Numeric)300./abs_t[i], x ) * abs_p[i] * abs_p[i] * abs_n2[i];

      // Loop frequency:
      for ( Index s=0; s<n_f; ++s )
  {
    pxsec(s,i) += dummy * pow( f_grid[s], (Numeric)2. );
  }
    }
}
//
// #################################################################################
// ################################### CLOUD AND RAIN MODELS #######################
// #################################################################################

void MPM93WaterDropletAbs( MatrixView         pxsec,
         const Numeric      CCin,   // input parameter
         const Numeric      CGin,   // input parameter
         const Numeric      CEin,   // input parameter
         const String&      model, // model
         ConstVectorView    f_grid, // frequency vector
         ConstVectorView    abs_p,  // pressure vector
         ConstVectorView    abs_t,  // temperature vector
         ConstVectorView    vmr)    // suspended water droplet density vector
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21)
  const Numeric CC_MPM93 = 1.00000;
  const Numeric CG_MPM93 = 1.00000;
  const Numeric CE_MPM93 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CG, CE;
  if ( model == "MPM93" )
    {
      CC = CC_MPM93;
      CG = CG_MPM93;
      CE = CE_MPM93;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CG = CGin;
      CE = CEin;
    }
  else
    {
      ostringstream os;
      os << "liquidcloud-MPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "liquidcloud-MPM93: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CG = " << CG << "\n"
  << " CE = " << CE << "\n";


  const Numeric m = 1.00e3; // specific weight of the droplet,  fixed value:  1.00e3 kg/m³
  const Numeric low_lim_den  =  0.000;   // lower limit of suspended droplet particle density vector [kg/m³]
  const Numeric high_lim_den = 10.00e-3; // lower limit of suspended droplet particle density vector [kg/m³]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // water vapor saturation pressure over liquid water [Pa]
      // Numeric es       = WVSatPressureLiquidWater(abs_t[i]);
      // water vapor partial pressure [Pa]
      // Numeric e        = abs_p[i] * vmr[i];
      // relative humidity [1]
      // Numeric RH       = e / es;

      // Check limits of suspended water droplet density ("vmr") [kg/m³]
      if ( (vmr[i] > low_lim_den) && (vmr[i] < high_lim_den) )
  {
    // relative inverse temperature [1]
    Numeric theta    = 300.000 / abs_t[i];
    // relaxation frequencies [GHz]
    Numeric gamma1   = CG * 20.20 - 146.40*(theta-1.000) + 316.00*(theta-1.000)*(theta-1.000);
    // Numeric gamma1  = 20.1 * exp( 7.88 * theta ); // see Liebe et al. IJIMW, 1992, p667, Eq. (2b)
    Numeric gamma2   = 39.80 * gamma1;
    // static and high-frequency permittivities
    Numeric epsilon0 = CE * 103.30 * (theta-1.000) + 77.66;
    Numeric epsilon1 = 0.0671 * epsilon0;
    Numeric epsilon2 = 3.52;

    // Loop frequency:
    for ( Index s=0; s<n_f; ++s )
      {
        // real part of the complex permittivity of water (double-debye model)
        Numeric Reepsilon  = epsilon0 -
    pow((f_grid[s]*Hz_to_GHz),(Numeric)2.) *
    ( ((epsilon0-epsilon1)/
       (pow((f_grid[s]*Hz_to_GHz),(Numeric)2.)
                    + pow(gamma1,(Numeric)2.))) +
      ((epsilon1-epsilon2)/
       (pow((f_grid[s]*Hz_to_GHz),(Numeric)2.)
                    + pow(gamma2,(Numeric)2.))) );
        // imaginary part of the complex permittivity of water (double-debye model)
        Numeric Imepsilon  = (f_grid[s]*Hz_to_GHz) *
    ( (gamma1*(epsilon0-epsilon1)/
       (pow((f_grid[s]*Hz_to_GHz),(Numeric)2.)
                    + pow(gamma1,(Numeric)2.))) +
      (gamma2*(epsilon1-epsilon2)/
       (pow((f_grid[s]*Hz_to_GHz),(Numeric)2.)
                    + pow(gamma2,(Numeric)2.))) );
        // the imaginary part of the complex refractivity of suspended liquid water particle [ppm]
        // In MPM93 w is in g/m³ and m is in g/cm³. Because of the units used in arts,
        // a factor of 1.000e6 must be multiplied with the ratio (w/m):
        // MPM93: (w/m)_MPM93  in   (g/m³)/(g/cm³)
        // arts:  (w/m)_arts   in  (kg/m³)/(kg/m³)
        // =====> (w/m)_MPM93   =   1.0e6 * (w/m)_arts
        // the factor of 1.0e6 is included below in pxsec calculation.
        Numeric ImNw = 1.500 / m *
    ( 3.000 * Imepsilon
                  / ( pow((Reepsilon+(Numeric)2.000),(Numeric)2.)
                      + pow(Imepsilon,(Numeric)2.) ) );
        // liquid water particle absorption cross section [1/m]
        // The vmr of H2O will be multiplied at the stage of absorption
        // calculation: abs = vmr * pxsec.
        // pxsec = abs/vmr [1/m] but MPM93 is in [dB/km] --> conversion necessary
        pxsec(s,i) += CC * 1.000e6 * dB_km_to_1_m * 0.1820 * (f_grid[s]*Hz_to_GHz) * ImNw;
      }
  } else
    {
      if ( (vmr[i] < low_lim_den) || (vmr[i] > high_lim_den) )
        {
    ostringstream os;
    os << "ERROR in MPM93WaterDropletAbs:\n"
       << " suspended water droplet density (valid range 0.00-10.00e-3 kg/m3):" << vmr[i] << "\n"
       << " ==> no calculation performed!\n";
    throw runtime_error(os.str());
        }
    }
    }

}
//
// #################################################################################

void MPM93IceCrystalAbs( MatrixView        pxsec,
       const Numeric     CCin,   // input parameter
       const Numeric     CAin,   // input parameter
       const Numeric     CBin,   // input parameter
       const String&     model, // model
       ConstVectorView   f_grid, // frequency vector
       ConstVectorView   abs_p,  // pressure vector
       ConstVectorView   abs_t,  // temperature vector
       ConstVectorView   vmr   ) // suspended ice particle density vector,
                                                   // valid range: 0-10.0e-3 kg/m³
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model (J. Liebe and G. A. Hufford and M. G. Cotton,
  // "Propagation modeling of moist air and suspended water/ice
  // particles at frequencies below 1000 GHz",
  // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
  // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21)
  const Numeric CC_MPM93 = 1.00000;
  const Numeric CA_MPM93 = 1.00000;
  const Numeric CB_MPM93 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CC, CA, CB;
  if ( model == "MPM93" )
    {
      CC = CC_MPM93;
      CA = CA_MPM93;
      CB = CB_MPM93;
    }
  else if ( model == "user" )
    {
      CC = CCin;
      CA = CAin;
      CB = CBin;
    }
  else
    {
      ostringstream os;
      os << "icecloud-MPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "icecloud-MPM93: (model=" << model << ") parameter values in use:\n"
  << " CC = " << CC << "\n"
  << " CA = " << CA << "\n"
  << " CB = " << CB << "\n";


  const Numeric m = 0.916e3;  // specific weight of ice particles,  fixed value:   0.916e3 kg/m³
  const Numeric low_lim_den  =  0.000;   // lower limit of suspended ice particle density vector [kg/m³]
  const Numeric high_lim_den = 10.00e-3; // lower limit of suspended ice particle density vector [kg/m³]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );



  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // water vapor saturation pressure over ice [Pa]
      // Numeric es = WVSatPressureIce(abs_t[i]);
      // water vapor partial pressure [Pa]
      // Numeric e  = abs_p[i] * vmr[i];
      // relative humidity [1]
      // Numeric RH = e / es;

      // Check limits of suspended water ice crystal density ("vmr") [kg/m³]
      if ( (vmr[i] > low_lim_den) && (vmr[i] < high_lim_den) )
  {
    // relative inverse temperature [1]
    Numeric theta = 300.000 / abs_t[i];
    // inverse frequency T-dependency function [Hz]
    Numeric ai = CA * (62.000 * theta - 11.600) * exp(-22.100 * (theta-1.000)) * 1.000e-4;
    // linear frequency T-dependency function [1/Hz]
    Numeric bi = CB * 0.542e-6 *
           ( -24.17 + (116.79/theta)
                         + pow((theta/(theta-(Numeric)0.9927)),(Numeric)2.) );

    // Loop frequency:
    for ( Index s=0; s<n_f; ++s )
      {
        // real part of the complex permittivity of ice
        Numeric Reepsilon  = 3.15;
        // imaginary part of the complex permittivity of water
        Numeric Imepsilon  = ( ( ai/(f_grid[s]*Hz_to_GHz) ) +
             ( bi*(f_grid[s]*Hz_to_GHz) ) );
        // the imaginary part of the complex refractivity of suspended ice particles.
        // In MPM93 w is in g/m³ and m is in g/cm³. Because of the units used in arts,
        // a factor of 1.000e6 must be multiplied with the ratio (w/m):
        // MPM93: (w/m)_MPM93  in   (g/m³)/(g/cm³)
        // arts:  (w/m)_arts   in  (kg/m³)/(kg/m³)
        // =====> (w/m)_MPM93   =   1.0e6 * (w/m)_arts
        // the factor of 1.0e6 is included below in pxsec calculation.
        Numeric ImNw = 1.500 / m *
        ( 3.000 * Imepsilon
                      / ( pow((Reepsilon+(Numeric)2.000),(Numeric)2.)
                          + pow(Imepsilon,(Numeric)2.) ) );
        // ice particle absorption cross section [1/m]
        // The vmr of H2O will be multiplied at the stage of absorption
        // calculation: abs = vmr * pxsec.
        // pxsec = abs/vmr [1/m] but MPM93 is in [dB/km] --> conversion necessary
        pxsec(s,i) += CC * 1.000e6 * dB_km_to_1_m * 0.1820 * (f_grid[s]*Hz_to_GHz) * ImNw;
      }
  } else
    {
      if ( (vmr[i] < low_lim_den) || (vmr[i] > high_lim_den) )
        {
    ostringstream os;
    os << "ERROR in MPM93IceCrystalAbs:\n"
       << " suspended ice particle density (valid range: 0-10.0e-3 kg/m3):" << vmr[i] << "\n"
       << " ==> no calculation performed!\n";
    throw runtime_error(os.str());
        }
    }
    }
  return;
}
//
// #################################################################################

void MPM93RainExt( MatrixView         pxsec,
       const Numeric      CEin,   // input parameter
       const Numeric      CAin,   // input parameter
       const Numeric      CBin,   // input parameter
       const String&      model, // model
       ConstVectorView    f_grid, // frequency vector
       ConstVectorView    abs_p,  // pressure vector
       ConstVectorView    abs_t _U_,  // temperature vector
       ConstVectorView    vmr)    // rain rate profile [mm/h]
{

  // --------- STANDARD MODEL PARAMETERS ---------------------------------------------------
  // standard values for the MPM93 model based on Olsen, R.L.,
  // D.V. Rogers, and D. B. Hodge, "The aR^b relation in the
  // calculation of rain attenuation", IEEE Trans. Antennas Propagat.,
  // vol. AP-26, pp. 318-329, 1978,
  const Numeric CE_MPM93 = 1.00000;
  const Numeric CA_MPM93 = 1.00000;
  const Numeric CB_MPM93 = 1.00000;
  // ---------------------------------------------------------------------------------------


  // select the parameter set (!!model dominates values!!):
  Numeric CE, CA, CB;
  if ( model == "MPM93" )
    {
      CE = CE_MPM93;
      CA = CA_MPM93;
      CB = CB_MPM93;
    }
  else if ( model == "user" )
    {
      CE = CEin;
      CA = CAin;
      CB = CBin;
    }
  else
    {
      ostringstream os;
      os << "rain-MPM93: ERROR! Wrong model values given.\n"
   << "Valid models are: 'MPM93' and 'user'" << '\n';
      throw runtime_error(os.str());
    }
  out3  << "rain-MPM93: (model=" << model << ") parameter values in use:\n"
  << " CE = " << CE << "\n"
  << " CA = " << CA << "\n"
  << " CB = " << CB << "\n";


  const Numeric low_lim_rr  =  0.000;   // lower limit of allowed rain rate  [mm/h]
  const Numeric high_lim_rr = 150.000;  // upper limit of allowed rain rate  [mm/h]

  const Index n_p = abs_p.nelem();  // Number of pressure levels
  const Index n_f = f_grid.nelem();  // Number of frequencies

  // Check that dimensions of abs_p, abs_t, and vmr agree:
  assert ( n_p==abs_t.nelem() );
  assert ( n_p==vmr.nelem()   );

  // Check that dimensions of pxsec are consistent with n_f
  // and n_p. It should be [n_f,n_p]:
  assert ( n_f==pxsec.nrows() );
  assert ( n_p==pxsec.ncols() );

  // Loop pressure/temperature:
  for ( Index i=0; i<n_p; ++i )
    {
      // Extinction by rain is parameterized as:
      //  ext_rain = a_rain * rr ^ b_rain
      // a_rain and b_rain each depend on frequency by  power laws:
      //  a_rain = Ga * freq ^ Ea
      //  b_rain = Gb * freq ^ Eb
      Numeric Ga = 0.;
      Numeric Ea = 0.;
      Numeric Gb = 0.;
      Numeric Eb = 0.;
      // FIXME Numeric a_rain;
      // FIXME Numeric b_rain;
      // FIXME Numeric ext_rain;

      // Check limits of rain rate ("vmr") [mm/h]
      if ( (vmr[i] >= low_lim_rr) && (vmr[i] < high_lim_rr) )
  {
    // Loop frequency:
    for ( Index s=0; s<n_f; ++s )
      {
        // for rain rate < 25 mm/h, take parameters from Olsen et al.'s
        // own power law fit to their Laws-Parsons-Low data;
        // for rain rate > 25 mm/h, take C. Melsheimer's power law fit
        // to Olsen et al.'s Laws-Parson-High data
        if ( vmr[i] <= 25 )
    {
      // power law coeff. Ga and exponent Ea for a, piecewise:
      if ( f_grid[s] <= 2.9e9 )
        {
          Ga = 6.39e-5;
          Ea = 2.03;
        }
      else if ( f_grid[s] <= 54.0e9 )
        {
          Ga = 4.21e-5;
          Ea = 2.42;
        }
      else if ( f_grid[s] <= 180e9 )
        {
          Ga = 4.09e-2;
          Ea = 0.699;
        }
      else if ( f_grid[s] <= 1000e9 )
        {
          Ga = 3.38;
          Ea = -0.151;
        }
      else
        {
          ostringstream os;
          os << "ERROR in MPM93RainExt:\n"
       << " frequency (valid range 0-1000 GHz):" << f_grid[s]*Hz_to_GHz << "\n"
       << " ==> no calculation performed!\n";
          throw runtime_error(os.str());
        }
      // power law coeff. Gb and exponent Eb for b, piecewise:
      if ( f_grid[s] <= 8.5e9 )
        {
          Gb = 0.851;
          Eb = 0.158;
        }
      else if ( f_grid[s] <= 25.0e9 )
        {
          Gb = 1.41;
          Eb = -0.0779;
        }
      else if ( f_grid[s] <= 164.0e9 )
        {
          Gb = 2.63;
          Eb = -0.272;
        }
      else if ( f_grid[s] <= 1000e9 )
        {
          Gb = 0.616;
          Eb = 0.0126;
        }
      else
        {
          ostringstream os;
          os << "ERROR in MPM93RainExt:\n"
       << " frequency (valid range 0-1000 GHz):" << f_grid[s]*Hz_to_GHz << "\n"
       << " ==> no calculation performed!\n";
          throw runtime_error(os.str());
        }

    }
        else if (vmr[i] > 25)
    {
      // power law coeff. Ga and exponent Ea for a, piecewise:
      if ( f_grid[s] <= 4.9e9 )
        {
          Ga = 5.30e-5;
          Ea = 1.87;
        }
      else if ( f_grid[s] <= 10.7e9 )
        {
          Ga = 5.03e-6;
          Ea = 3.35;
        }
      else if ( f_grid[s] <= 40.1e9 )
        {
          Ga = 2.53e-5;
          Ea = 2.67;
        }
      else if ( f_grid[s] <= 59.1e9 )
        {
          Ga = 3.58e-3;
          Ea = 1.33;
        }
      else if ( f_grid[s] <= 100e9 )
        {
          Ga = 0.143;
          Ea = 0.422;
        }
      else
        {
          ostringstream os;
          os << "ERROR in MPM93RainExt:\n"
       << " frequency (valid range for rain rate > 25mm/h: 0-100 GHz):" << f_grid[s]*Hz_to_GHz << "\n"
       << " ==> no calculation performed!\n";
          throw runtime_error(os.str());
        }
      // power law coeff. Gb and exponent Eb for b, piecewise:
      if ( f_grid[s] <= 6.2e9 )
        {
          Gb = 0.911;
          Eb = 0.190;
        }
      else if ( f_grid[s] <= 23.8e9 )
        {
          Gb = 1.71;
          Eb = -0.156;
        }
      else if ( f_grid[s] <= 48.4e9 )
        {
          Gb = 3.08;
          Eb = -0.342;
        }
      else if ( f_grid[s] <= 68.2e9 )
        {
          Gb = 1.28;
          Eb = -0.116;
        }
      else if ( f_grid[s] <= 100e9 )
        {
          Gb =  0.932;
          Eb =  -0.0408;
        }
      else
        {
          ostringstream os;
          os << "ERROR in MPM93RainExt:\n"
       << " frequency (valid range for rain rate > 25mm/h: 0-100 GHz):" << f_grid[s]*Hz_to_GHz << "\n"
       << " ==> no calculation performed!\n";
          throw runtime_error(os.str());
        }
    }
        //Factor a_rain
        Numeric a_rain = Ga * pow((f_grid[s]*Hz_to_GHz),Ea);
        //Factor b_rain
        Numeric b_rain = Gb * pow((f_grid[s]*Hz_to_GHz),Eb);
        // Extinction coefficient [dB/km], with scaling
        // parameters CA and CB
        Numeric ext_rain = CA * a_rain * pow(vmr[i],(CB*b_rain));
        // rain extinction cross section [1/m]
        // The vmr will be multiplied at the stage of extinction
        // calculation: ext = vmr * pxsec.
        // pxsec = ext/vmr [1/m] but MPM93 is in [dB/km] --> conversion necessary
        pxsec(s,i) += CE * dB_km_to_1_m * ext_rain / vmr[i];
      }
  } else
    {
      if ( (vmr[i] < low_lim_rr) || (vmr[i] > high_lim_rr) )
        {
    ostringstream os;
    os << "ERROR in MPM93RainExt:\n"
       << " rain rate (valid range 0.00-150.00 mm/h):" << vmr[i] << "\n"
       << " ==> no calculation performed!\n";
    throw runtime_error(os.str());
        }
    }
    }

}
//
// #################################################################################
// ################################# HELP FUNCTIONS ################################
// #################################################################################
//
Numeric MPMLineShapeFunction( const Numeric gamma,
            const Numeric fl,
            const Numeric f)
{
  /*
    this routine calculates the line shape function of Van Vleck and Weisskopf
    with the factor (f/f_o)¹. for the MPM pseudo continuum line.

    creation  TKS, 4.11.00

    input:   gamma   [Hz]    line width of line L
             fl      [Hz]    central frequency of line L
             f       [Hz]    frequency position of calculation

    output:  value   [1/Hz]  line shape function value at f for the line parameters
                              of line L

   */

  double f_minus, f_plus ;           /* internal variables */
  double value;                      /* return value       */

  // line at fl
  f_minus = 1.000 / ((f-fl)*(f-fl) + gamma*gamma);

  // mirror line at -fl
  f_plus  = 1.000 / ((f+fl)*(f+fl) + gamma*gamma);

  // VVW line shape function value
  value = fabs(f/fl) * gamma * (f_minus + f_plus);

  return value;
}
//
// #################################################################################
//
Numeric MPMLineShapeO2Function( const Numeric gamma,
        const Numeric fl,
        const Numeric f,
                                const Numeric delta)
{
  /*
    this routine calculates the line shape function of Van Vleck and Weisskopf
    for O2 with line mixing.

    creation  TKS, 14.07.01

    input:   gamma   [GHz]    line width of line L
             fl      [GHz]    central frequency of line L
             f       [GHz]    frequency position of calculation
             delta   [1]     line mixing parameter

    output:  value   [1]     line shape function value at f for the line parameters
                             of line L

   */

  double f_minus, f_plus ;           /* internal variables */
  double value;                      /* return value       */

  // line at fl
  f_minus = (gamma - delta * (fl-f)) / ((fl-f)*(fl-f) + gamma*gamma);

  // mirror line at -fl
  f_plus  = (gamma - delta * (fl+f)) / ((fl+f)*(fl+f) + gamma*gamma);

  // VVW line shape function value
  value = f * (f_minus + f_plus);

  return value;
}
//
// #################################################################################
//
Numeric WVSatPressureLiquidWater(const Numeric t)
{

  // check of temperature range
  if (t < 0.000)
    {
      ostringstream os;
      os << "In WVSatPressureLiquidWater:\n"
   << "temperature negative: T=" << t <<"K \n";
      throw runtime_error(os.str());
    }

  //  COMPUTES SATURATION H2O VAPOR PRESSURE (OVER LIQUID)
  //  USING LIEBE'S APPROXIMATION (CORRECTED)
  //  input  : T in Kelvin
  //  output : es in Pa
  //  PWR 4/8/92
  /*
  Numeric TH       = 300.0 / t;
  Numeric es_PWR98 = 100.00 * 35.3 * exp(22.64*(1.-TH)) * pow(TH,5.0);
  */

  // MPM93 calculation
  Numeric theta    = 373.16 / t;
  Numeric exponent = ( -7.90298 * (theta-1.000) +
            5.02808 * log10(theta) -
            1.3816e-7 * ( pow( (Numeric)10.00,
                                           ((Numeric)11.344*
                                            ((Numeric)1.00-((Numeric)1.00
                                                             /theta))) )
                                      - (Numeric)1.000 ) +
            8.1328e-3 * ( pow( (Numeric)10.00,
                                           ((Numeric)-3.49149
                                            *(theta-(Numeric)1.00)))
                                      - 1.000) +
            log10(1013.246) );
  Numeric es_MPM93 = 100.000 * pow((Numeric)10.00,exponent);

  return es_MPM93; // [Pa]
}
//
// #################################################################################
//
Numeric WVSatPressureIce(const Numeric t)
{

  // check of temperature range
  if (t < 0.000)
    {
      ostringstream os;
      os << "In WVSatPressureIce:\n"
   << "temperature negative: T=" << t <<"K \n";
      throw runtime_error(os.str());
    }

  // MPM93 calculation
  Numeric theta    = 273.16 / t;
  Numeric exponent = (-9.09718  * (theta-1.000) -
           3.56654  * log10(theta)  +
           0.876793 * (1.000-(1.000/theta)) +
           log10(6.1071) );

  Numeric es_MPM93 = 100.000 * pow((Numeric)10.00,exponent);

  return es_MPM93;
}
//
// #################################################################################
// #################### CONTROL OF ADDITIONAL ABSORPTION MODEL #####################
// #################################################################################
//
//
void xsec_continuum_tag( MatrixView             xsec,
                         const String&          name,
                         ConstVectorView        parameters,
                         const String&          model,
                         ConstVectorView        f_grid,
                         ConstVectorView        abs_p,
                         ConstVectorView        abs_t,
                         ConstVectorView        abs_n2,
                         ConstVectorView        abs_h2o,
                         ConstVectorView        vmr )
{
  /* In the following all the possible tags are listed here and
     after a first consistency check about the input parameters the
     appropriate internal function is called,

     !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
     ATTENTION PLEASE UPDATE THIS COMMENT IF ANY CHANGES ARE MADE CONCERNING
     THE ASSOCIATED MODELS TO EACH TAG
     !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

     ----------------------------------------------------------------------------------------------------
     TAG                      VALID MODELS
     ----------------------------------------------------------------------------------------------------
     *CONTAGMODINFO*   H2O-SelfContStandardType: Rosenkranz, user
     *CONTAGMODINFO*   H2O-ForeignContStandardType: Rosenkranz, user
     *CONTAGMODINFO*   H2O-ForeignContMaTippingType: MaTipping, user
     *CONTAGMODINFO*   H2O-MPM87:               MPM87, MPM87Lines, MPM87Continuum, user
     *CONTAGMODINFO*   H2O-MPM89:               MPM89, MPM89Lines, MPM89Continuum, user
     *CONTAGMODINFO*   H2O-MPM93:               MPM93, MPM93Lines, MPM93Continuum, user
     *CONTAGMODINFO*   H2O-PWR98:               Rosenkranz, RosenkranzLines, RosenkranzContinuum, user
     *CONTAGMODINFO*   H2O-CP98:                CruzPol, CruzPolLine, CruzPolContinuum, user
     *CONTAGMODINFO*   H2O-CKD24:               CKD24, user
     *CONTAGMODINFO*   O2-MPM85:                MPM85, MPM85Lines, MPM85Continuum, MPM85NoCoupling, MPM85NoCutoff, user
     *CONTAGMODINFO*   O2-MPM87:                MPM87, MPM87Lines, MPM87Continuum, MPM87NoCoupling, MPM87NoCutoff, user
     *CONTAGMODINFO*   O2-MPM89:                MPM89, MPM89Lines, MPM89Continuum, MPM89NoCoupling, MPM89NoCutoff, user
     *CONTAGMODINFO*   O2-MPM92:                MPM92, MPM92Lines, MPM92Continuum, MPM92NoCoupling, MPM92NoCutoff, user
     *CONTAGMODINFO*   O2-MPM93:                MPM93, MPM93Lines, MPM93Continuum, MPM93NoCoupling, MPM92NoCutoff, user
     *CONTAGMODINFO*   O2-PWR93:                Rosenkranz, RosenkranzLines, RosenkranzContinuum, user
     *CONTAGMODINFO*   O2-PWR88:                Rosenkranz, RosenkranzLines, RosenkranzContinuum, user
     *CONTAGMODINFO*   O2-SelfContMPM93:        MPM93, user
     *CONTAGMODINFO*   O2-SelfContPWR93:        Rosenkranz, user
     *CONTAGMODINFO*   O2-GenerealCont:         Rosenkranz, MPM93, user
     *CONTAGMODINFO*   N2-BFCIA86:              BF86, user
     *CONTAGMODINFO*   N2-SelfContMPM93:        MPM93, user, MPM93Scale
     *CONTAGMODINFO*   N2-SelfContPWR93:        Rosenkranz, user
     *CONTAGMODINFO*   N2-SelfContStandardType: Rosenkranz, user
     *CONTAGMODINFO*   CO2-SelfContPWR93:       Rosenkranz, user
     *CONTAGMODINFO*   CO2-ForeignContPWR93:    Rosenkranz, user
     *CONTAGMODINFO*   liquidcloud-MPM93:       MPM93, user
     *CONTAGMODINFO*   icecloud-MPM93:          MPM93, user
     *CONTAGMODINFO*   rain-MPM93:              MPM93, user
     ----------------------------------------------------------------------------------------------------
  */

  // Set up a lokal variable pxsec for the pseudo cross sections, that
  // are used by the internal contiuum functions. It is important that
  // we also inititialize this to zero here, since the continuum
  // routines just add to this.
  // The dimensions of this are [n_frequencies,n_pressures].
  Matrix pxsec(xsec.nrows(),xsec.ncols(),0.0);

  // ============= H2O continuum ========================================================
  if ( "H2O-SelfContStandardType"==name )
    {
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum coefficient (C_s)  [1/m / (Hz²*Pa²)]
      //     parameters[1] : temperature exponent  (x_s)  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Standard_H2O_self_continuum( pxsec,
                                       parameters[0],
                                       parameters[1],
                                       model,
                                       f_grid,
                                       abs_p,
                                       abs_t,
                                       vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Standard_H2O_self_continuum( pxsec,
                                       0.00,
                                       0.00,
                                       model,
                                       f_grid,
                                       abs_p,
                                       abs_t,
                                       vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContStandardType"==name )
    {
      //
      // specific continuum parameters units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : [1/m / (Hz²*Pa²)]
      //     parameters[1] : [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Standard_H2O_foreign_continuum( pxsec,
                                          parameters[0],
                                          parameters[1],
                                          model,
                                          f_grid,
                                          abs_p,
                                          abs_t,
                                          vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Standard_H2O_foreign_continuum( pxsec,
                                          0.00,
                                          0.00,
                                          model,
                                          f_grid,
                                          abs_p,
                                          abs_t,
                                          vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContMaTippingType"==name )
    {
      //
      // specific continuum parameters units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : [1/m / (Hz²*Pa²)]
      //     parameters[1] : [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MaTipping_H2O_foreign_continuum( pxsec,
                                           parameters[0],
                                           parameters[1],
                                           model,
                                           f_grid,
                                           abs_p,
                                           abs_t,
                                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MaTipping_H2O_foreign_continuum( pxsec,
                                           0.00,
                                           0.00,
                                           model,
                                           f_grid,
                                           abs_p,
                                           abs_t,
                                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ContMPM93"==name )
    {
      // self and foreign continuum term are simultaneously calculated
      // since the parameterization can not be divided up in these two
      // terms because they are not additive terms.
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : pseudo continuum line frequency                      [Hz]
      //     parameters[1] : pseudo continuum line strength parameter             [Hz/Pa]
      //     parameters[2] : pseudo continuum line strength temperature parameter [1]
      //     parameters[3] : pseudo continuum line broadening parameter           [Hz/Pa]
      //     parameters[4] : pseudo continuum line broadening parameter           [1]
      //     parameters[5] : pseudo continuum line broadening parameter           [1]
      //     parameters[6] : pseudo continuum line broadening parameter           [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 7;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93_H2O_continuum( pxsec,
                               parameters[0],
                               parameters[1],
                               parameters[2],
                               parameters[3],
                               parameters[4],
                               parameters[5],
                               parameters[6],
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr   );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93_H2O_continuum( pxsec,
                               0.00,
                               0.00,
                               0.00,
                               0.00,
                               0.00,
                               0.00,
                               0.00,
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr   );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContATM01"==name )
    {
      // Foreign wet continuum term.
      //
      // Pardo et al., IEEE, Trans. Ant. Prop.,
      // Vol 49, No 12, pp. 1683-1694, 2001.
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : pseudo continuum line frequency                      [Hz]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Pardo_ATM_H2O_ForeignContinuum( pxsec,
                                          parameters[0],
                                          model,
                                          f_grid,
                                          abs_p,
                                          abs_t,
                                          vmr   );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Pardo_ATM_H2O_ForeignContinuum( pxsec,
                                          0.000,
                                          model,
                                          f_grid,
                                          abs_p,
                                          abs_t,
                                          vmr   );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-SelfContCKD222"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O self continuum according to CKD2.2.2    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_222_self_h2o( pxsec,
                            parameters[0],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr,
                            abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_222_self_h2o( pxsec,
                            0.000,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr,
                            abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContCKD222"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O foreign continuum according to CKD2.2.2    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_222_foreign_h2o( pxsec,
                               parameters[0],
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_222_foreign_h2o( pxsec,
                               0.000,
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-SelfContCKD242"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O self continuum according to CKD2.4.2    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_242_self_h2o( pxsec,
                            parameters[0],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr,
                            abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_242_self_h2o( pxsec,
                            0.000,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr,
                            abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContCKD242"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O foreign continuum according to CKD2.4.2    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_242_foreign_h2o( pxsec,
                               parameters[0],
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_242_foreign_h2o( pxsec,
                               0.000,
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-SelfContCKDMT100"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O self continuum according to CKD MT 1.00    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_100_self_h2o( pxsec,
                               parameters[0],
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_100_self_h2o( pxsec,
                               0.000,
                               model,
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr,
                               abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContCKDMT100"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O foreign continuum according to CKD MT 1.00    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_100_foreign_h2o( pxsec,
                                  parameters[0],
                                  model,
                                  f_grid,
                                  abs_p,
                                  abs_t,
                                  vmr,
                                  abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_100_foreign_h2o( pxsec,
                                  0.000,
                                  model,
                                  f_grid,
                                  abs_p,
                                  abs_t,
                                  vmr,
                                  abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-SelfContCKD24"==name )
    {
      // OUTPUT:
      //   pxsec           cross section (absorption/volume mixing ratio) of
      //                  H2O continuum according to CKD2.4    [1/m]
      // INPUT:
      //   parameters[0]  strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD24_H20( pxsec,
                     0,
                     parameters[0],
                     model,
                     f_grid,
                     abs_p,
                     abs_t,
                     vmr,
                     abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD24_H20( pxsec,
                     0,
                     0.000,
                     model,
                     f_grid,
                     abs_p,
                     abs_t,
                     vmr,
                     abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-ForeignContCKD24"==name )
    {
      // OUTPUT:
      //   pxsec             cross section (absorption/volume mixing ratio) of
      //                    H2O continuum according to CKD2.4    [1/m]
      // INPUT:
      //   Cin            strength scaling factor              [1]
      //   model          allows user defined input parameter set
      //                  (Cin) or choice of
      //                  pre-defined parameters of specific models (see note below).
      //   f_grid         predefined frequency grid            [Hz]
      //   abs_p          predefined pressure grid             [Pa]
      //   abs_t          predefined temperature grid          [K]
      //   vmr            H2O volume mixing ratio profile      [1]
      //   abs_n2         N2 volume mixing ratio profile       [1]
      //
      // WWW resource: ftp.aer.com/aer_contnm_ckd
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD24_H20( pxsec,
                     1,
                     parameters[0],
                     model,
                     f_grid,
                     abs_p,
                     abs_t,
                     vmr,
                     abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD24_H20( pxsec,
                     1,
                     0,
                     model,
                     f_grid,
                     abs_p,
                     abs_t,
                     vmr,
                     abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= H2O full models ======================================================
  else if ( "H2O-CP98"==name )
    {
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scale factor       (CC) [1]
      //     parameters[1] : line strength scale factor   (CL) [1]
      //     parameters[2] : line broadening scale factor (CW) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CP98H2OAbsModel( pxsec,
                           parameters[0],
                           parameters[1],
                           parameters[2],
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CP98H2OAbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-MPM87"==name )
    {
      //
      // specific continuum parameters and units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : continuum scale factor (CC)       [1]
      //     parameters[1] : line strength scale factor   (CL) [1]
      //     parameters[2] : line broadening scale factor (CW) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM87H2OAbsModel( pxsec,
                            parameters[0],
                            parameters[1],
                            parameters[2],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM87H2OAbsModel( pxsec,
                            0.00,
                            0.00,
                            0.00,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-MPM89"==name )
    {
      //
      // specific continuum parameters and units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : continuum scale factor       (CC) [1]
      //     parameters[1] : line strength scale factor   (CL) [1]
      //     parameters[2] : line broadening scale factor (CW  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM89H2OAbsModel( pxsec,
                            parameters[0],
                            parameters[1],
                            parameters[2],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM89H2OAbsModel( pxsec,
                            0.00,
                            0.00,
                            0.00,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-MPM93"==name )
    {
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scale factor       (CC) [1]
      //     parameters[1] : line strength scale factor   (CL) [1]
      //     parameters[2] : line broadening scale factor (CW) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93H2OAbsModel( pxsec,
                            parameters[0],
                            parameters[1],
                            parameters[2],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93H2OAbsModel( pxsec,
                            0.00,
                            0.00,
                            0.00,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "H2O-PWR98"==name )
    {
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scale factor       (CC) [1]
      //     parameters[1] : line strength scale factor   (CL) [1]
      //     parameters[2] : line broadening scale factor (CW) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          PWR98H2OAbsModel( pxsec,
                            parameters[0],
                            parameters[1],
                            parameters[2],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          PWR98H2OAbsModel( pxsec,
                            0.00,
                            0.00,
                            0.00,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= O2 continuum =========================================================
  else if ( "O2-CIAfunCKDMT100"==name )
    {
      // Model reference:
      // F. Thibault, V. Menoux, R. Le Doucen, L. Rosenman,
      // J.-M. Hartmann, Ch. Boulet,
      // "Infrared collision-induced absorption by O2 near 6.4 microns for
      // atmospheric applications: measurements and emprirical modeling",
      // Appl. Optics, 35, 5911-5917, (1996).
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scaling
      //     model         : model option ("CKD" or "user")
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o       : [1]
      //     vmr           : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_CIAfun_o2( pxsec,
                            parameters[0],
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_CIAfun_o2( pxsec,
                            0.00e0,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-v0v0CKDMT100"==name )
    {
      // Model reference:
      //   B. Mate, C. Lugez, G.T. Fraser, W.J. Lafferty,
      //   "Absolute Intensities for the O2 1.27 micron
      //   continuum absorption",
      //   J. Geophys. Res., 104, 30,585-30,590, 1999.
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scaling
      //     model         : model option ("CKD" or "user")
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //     abs_n2        : [1]
      //     abs_h2o       : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_v0v0_o2( pxsec,
                          parameters[0],
                          model,
                          f_grid,
                          abs_p,
                          abs_t,
                          vmr,
                          abs_n2 );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_v0v0_o2( pxsec,
                          0.0e0,
                          model,
                          f_grid,
                          abs_p,
                          abs_t,
                          vmr,
                          abs_n2 );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-v1v0CKDMT100"==name )
    {
      // Model reference:
      //   Mlawer, Clough, Brown, Stephen, Landry, Goldman, Murcray,
      //   "Observed  Atmospheric Collision Induced Absorption in Near Infrared Oxygen Bands",
      //   Journal of Geophysical Research, vol 103, no. D4, pp. 3859-3863, 1998.
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum scaling
      //     model         : model option ("CKD" or "user")
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //     abs_n2        : [1]
      //     abs_h2o       : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_v1v0_o2( pxsec,
                          parameters[0],
                          model,
                          f_grid,
                          abs_p,
                          abs_t,
                          vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_v1v0_o2( pxsec,
                          0.0e0,
                          model,
                          f_grid,
                          abs_p,
                          abs_t,
                          vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-SelfContStandardType"==name )
    {
      // MPM93, Rosenkranz 1993 O2 continuum:
      // see publication side of National Telecommunications and Information Administration
      //   http://www.its.bldrdoc.gov/pub/all_pubs/all_pubs.html
      // and ftp side for downloading the MPM93 original source code:
      //   ftp://ftp.its.bldrdoc.gov/pub/mpm93/
      //
      // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
      // "Atmospheric Remote Sensing by Microwave Radiometry",
      // John Wiley & Sons, Inc., 1993, ISBN 0-471-62891-3
      // (see also JQSRT, Vol.48, No.5/6 pp.629-643, 1992)
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum coefficient (C)    [1/m*1/Hz*1/Pa]
      //     parameters[1] : frequency coefficient (G0)   [Hz/Pa]
      //     parameters[3] : line width parameter  (G0A)  [1]
      //     parameters[3] : line width parameter  (G0B)  [1]
      //     parameters[2] : temperature exponent  (XG0d) [1]
      //     parameters[2] : temperature exponent  (x_s)  [1]
      //     parameters[5] : continuum coefficient (XG0w) [1]
      //     model   : model option ("MPM93", "Rosenkranz", or "user")
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o       : [1]
      //     vmr           : [1]
      //
      const int Nparam = 6;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Standard_O2_continuum( pxsec,
                                 parameters[0],
                                 parameters[1],
                                 parameters[2],
                                 parameters[3],
                                 parameters[4],
                                 parameters[5],
                                 model,
                                 f_grid,
                                 abs_p,
                                 abs_t,
                                 abs_h2o,
                                 vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Standard_O2_continuum( pxsec,
                                 0.00,
                                 0.00,
                                 0.00,
                                 0.00,
                                 0.00,
                                 0.00,
                                 model,
                                 f_grid,
                                 abs_p,
                                 abs_t,
                                 abs_h2o,
                                 vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-SelfContMPM93"==name )
    {
      // MPM93 O2 continuum:
      // see publication side of National Telecommunications and Information Administration
      //   http://www.its.bldrdoc.gov/pub/all_pubs/all_pubs.html
      // and ftp side for downloading the MPM93 original source code:
      //   ftp://ftp.its.bldrdoc.gov/pub/mpm93/

      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum coefficient (C)    [1/m / (Hz²*Pa²)]
      //     parameters[1] : temperature exponent  (x_s)  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o       : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93_O2_continuum( pxsec,
                              parameters[0],
                              parameters[1],
                              parameters[2],
                              parameters[3],
                              model,
                              f_grid,
                              abs_p,
                              abs_t,
                              abs_h2o,
                              vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93_O2_continuum( pxsec,
                              0.00,
                              0.00,
                              0.00,
                              0.00,
                              model,
                              f_grid,
                              abs_p,
                              abs_t,
                              abs_h2o,
                              vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-SelfContPWR93"==name )
    {
      // data information about this continuum:
      // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
      // "Atmospheric Remote Sensing by Microwave Radiometry",
      // John Wiley & Sons, Inc., 1993, ISBN 0-471-62891-3
      // (see also JQSRT, Vol.48, No.5/6 pp.629-643, 1992)
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum coefficient (C) [K²/(Hz*Pa*m)]
      //     parameters[1] : temperature exponent  (x) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Rosenkranz_O2_continuum( pxsec,
                                   parameters[0],
                                   parameters[1],
                                   parameters[2],
                                   parameters[3],
                                   model,
                                   f_grid,
                                   abs_p,
                                   abs_t,
                                   abs_h2o,
                                   vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Rosenkranz_O2_continuum( pxsec,
                                   0.00,
                                   0.00,
                                   0.00,
                                   0.00,
                                   model,
                                   f_grid,
                                   abs_p,
                                   abs_t,
                                   abs_h2o,
                                   vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= O2 full model ========================================================
  else if ( "O2-PWR88"==name )
    {
      //  REFERENCE FOR EQUATIONS AND COEFFICIENTS:
      //  P.W. ROSENKRANZ, CHAP. 2 AND APPENDIX, IN ATMOSPHERIC REMOTE SENSING
      //  BY MICROWAVE RADIOMETRY (M.A. JANSSEN, ED. 1993)
      //  AND
      //  H.J. LIEBE ET AL, JQSRT V.48, PP.629-643 (1992)
      //  (EXCEPT: SUBMILLIMETER LINE INTENSITIES FROM HITRAN92)
      //  AND
      //  P. W. ROSENKRANZ, INTERFERENCE COEFFICIENTS FOR THE
      //  OVERLAPPING OXYGEN LINES IN AIR, JQSRT, 1988, VOLUME 39, 287-297.
      //
      //  the only difference to the 1993 version is the line mixing
      //  parameter Y, which is taken from the above reference JQSRT, 1988.
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[1] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[1] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      const char *version="PWR88";
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-PWR93"==name )
    {
      //  REFERENCE FOR EQUATIONS AND COEFFICIENTS:
      //  P.W. ROSENKRANZ, CHAP. 2 AND APPENDIX, IN ATMOSPHERIC REMOTE SENSING
      //  BY MICROWAVE RADIOMETRY (M.A. JANSSEN, ED. 1993)
      //  AND H.J. LIEBE ET AL, JQSRT V.48, PP.629-643 (1992)
      //  (EXCEPT: SUBMILLIMETER LINE INTENSITIES FROM HITRAN92)
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[1] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[1] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      const char *version="PWR93";
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-PWR98"==name )
    {
      //  REFERENCES FOR EQUATIONS AND COEFFICIENTS:
      //    P.W. Rosenkranz, CHAP. 2 and appendix, in ATMOSPHERIC REMOTE SENSING
      //     BY MICROWAVE RADIOMETRY (M.A. Janssen, ed., 1993).
      //    H.J. Liebe et al, JQSRT V.48, PP.629-643 (1992).
      //    M.J. Schwartz, Ph.D. thesis, M.I.T. (1997).
      //    SUBMILLIMETER LINE INTENSITIES FROM HITRAN96.
      //    This version differs from Liebe's MPM92 in two significant respects:
      //    1. It uses the modification of the 1- line width temperature dependence
      //    recommended by Schwartz: (1/T).
      //    2. It uses the same temperature dependence (X) for submillimeter
      //    line widths as in the 60 GHz band: (1/T)**0.8
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[1] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[1] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      const char *version="PWR98";
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          PWR93O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           version,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-MPM93"==name )
    {
      //  H. J. Liebe and G. A. Hufford and M. G. Cotton,
      //  "Propagation modeling of moist air and suspended water/ice
      //   particles at frequencies below 1000 GHz",
      //  AGARD 52nd Specialists Meeting of the Electromagnetic Wave
      //  Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[2] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[3] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-MPM92"==name )
    {
      //   H. J. Liebe, P. W. Rosenkranz and G. A. Hufford,
      //   Atmospheric 60-GHz Oxygen Spectrum: New Laboratory
      //   Measurements and Line Parameters
      //   JQSRT, Vol 48, pp. 629-643, 1992
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[2] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[3] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM92O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM92O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-MPM89"==name )
    {
      //   H. J. Liebe,
      //   MPM - an atmospheric millimeter-wave propagation model,
      //   Int. J. Infrared and Mill. Waves, Vol 10, pp. 631-650, 1989.
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[2] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[3] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM89O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM89O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-MPM87"==name )
    {
      //   H. J. Liebe and D. H. Layton,
      //   Millimeter-wave properties of the atmosphere:
      //   Laboratory studies and propagation modelling,
      //   NITA Report 87-224,
      //   U.S. Dept. of Commerce, National Telecommunications and Information
      //   Administration, Institute for Communication Sciences, rep. 87-224,
      //   325 Broadway, Boulder, CO 80303-3328
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[2] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[3] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM87O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM87O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "O2-MPM85"==name )
    {
      //   H. J. Liebe and D. H. Layton,
      //   An updated model for millimeter wave propagation in moist air
      //   Radio Science, vol. 20, pp. 1069-1089, 1985
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum term scale factor,   default CC = 1.000 [1]
      //     parameters[1] : line strength scale factor,    default CL = 1.000 [1]
      //     parameters[2] : line broadening scale factor,  default CW = 1.000 [1]
      //     parameters[3] : line coupling scale factor,    default CO = 1.000 [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o,      : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Full model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM85O2AbsModel( pxsec,
                           parameters[0], // continuum term scale factor
                           parameters[1], // line strength scale factor
                           parameters[2], // line broadening scale factor
                           parameters[3], // line coupling scale factor
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Full model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Full model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM85O2AbsModel( pxsec,
                           0.00,
                           0.00,
                           0.00,
                           0.00,
                           model,
                           f_grid,
                           abs_p,
                           abs_t,
                           abs_h2o,
                           vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Full model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= N2 continuum =========================================================
  else if ( "N2-SelfContMPM93"==name )
    {
      // MPM93 N2 continuum:
      // see publication side of National Telecommunications and Information Administration
      //   http://www.its.bldrdoc.gov/pub/all_pubs/all_pubs.html
      // and ftp side for downloading the MPM93 original source code:
      //   ftp://ftp.its.bldrdoc.gov/pub/mpm93/
      //
      //  specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : strength parameter   [1/m * 1/(Hz²*Pa²)]
      //     parameters[1] : broadening parameter [1]
      //     parameters[2] : temperature exponent [1]
      //     parameters[3] : frequency exponent   [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_h2o       : [1]
      //     vmr           : [1]
      //
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93_N2_continuum( pxsec,
                              parameters[0],
                              parameters[1],
                              parameters[2],
                              parameters[3],
                              model,
                              f_grid,
                              abs_p,
                              abs_t,
                              abs_h2o,
                              vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model == "MPM93Scale") && (parameters.nelem() == 1) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93_N2_continuum( pxsec,
                              parameters[0],
                              0.00,
                              0.00,
                              0.00,
                              model,
                              f_grid,
                              abs_p,
                              abs_t,
                              abs_h2o,
                              vmr );
        }
      else if ( (model == "MPM93Scale") && (parameters.nelem() != 1) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires 1 scaling input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (model != "MPM93Scale") && (parameters.nelem() == 0) ) // --
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          MPM93_N2_continuum( pxsec,
                              0.00,
                              0.00,
                              0.00,
                              0.00,
                              model,
                              f_grid,
                              abs_p,
                              abs_t,
                              abs_h2o,
                              vmr );
        }
      /* --------------------------------------------------------------------------
         else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
         {
         ostringstream os;
         os << "ERROR: Continuum model " << name << " requires NO input\n"
         << "parameters for the model " << model << ",\n"
         << "but you specified " << parameters.nelem() << " parameters.\n"
         << "This ambiguity can not be solved by arts.\n"
         << "Please see the arts user guide chapter 3.\n";
         throw runtime_error(os.str());
         }
         ----------------------------------------------------------------------*/
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-DryContATM01"==name )
    {
      // data information about this continuum:
      // Pardo et al. model model (IEEE, Trans. Ant. Prop.,
      // Vol 49, No 12, pp. 1683-1694, 2001)
      //
      // specific continuum parameters and units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : continuum strength coefficient  [1/m * 1/(Hz*Pa)²]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]   for  N2
      //     h2ovmr        : [1]   for  H2O
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Pardo_ATM_N2_dry_continuum( pxsec,
                                      parameters[0], // coefficient
                                      model,
                                      f_grid,
                                      abs_p,
                                      abs_t,
                                      vmr,
                                      abs_h2o );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Pardo_ATM_N2_dry_continuum( pxsec,
                                      0.000, // coefficient
                                      model,
                                      f_grid,
                                      abs_p,
                                      abs_t,
                                      vmr,
                                      abs_h2o );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-SelfContPWR93"==name )
    {
      // data information about this continuum:
      // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
      // "Atmospheric Remote Sensing by Microwave Radiometry",
      // John Wiley & Sons, Inc., 1993, ISBN 0-471-62891-3
      //
      // specific continuum parameters and units:
      //  a) output
      //     pxsec          : [1/m],
      //  b) input
      //     parameters[0] : continuum strength coefficient  [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : continuum temperature exponent  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Rosenkranz_N2_self_continuum( pxsec,
                                        parameters[0], // coefficient
                                        parameters[1], // temp. exponent
                                        model,
                                        f_grid,
                                        abs_p,
                                        abs_t,
                                        vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Rosenkranz_N2_self_continuum( pxsec,
                                        0.00,
                                        0.00,
                                        model,
                                        f_grid,
                                        abs_p,
                                        abs_t,
                                        vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-SelfContStandardType"==name )
    {
      // data information about this continuum:
      // A completely general expression for the N2 continuum
      //
      // specific continuum parameters and units:
      // OUTPUT
      //     pxsec          : [1/m],
      // INPUT
      //     parameters[0] : continuum coefficient (C)  [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : frequency exponent    (xf) [1]
      //     parameters[2] : temperature exponent  (xt) [1]
      //     parameters[3] : pressure exponent     (xp) [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      const int Nparam = 4;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Standard_N2_self_continuum( pxsec,
                                      parameters[0],
                                      parameters[1],
                                      parameters[2],
                                      parameters[3],
                                      model,
                                      f_grid,
                                      abs_p,
                                      abs_t,
                                      vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Standard_N2_self_continuum( pxsec,
                                      0.000,
                                      0.000,
                                      0.000,
                                      0.000,
                                      model,
                                      f_grid,
                                      abs_p,
                                      abs_t,
                                      vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-SelfContBorysow"==name )
    {
      // data information about this continuum:
      // A. Borysow and L. Frommhold, The Astrophysical Journal,
      // Vol. 311, pp.1043-1057, 1986
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          BF86_CIA_N2( pxsec,
                       parameters[0], // scaling factor
                       model,
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr   );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          BF86_CIA_N2( pxsec,
                       0.0,
                       model,
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr   );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-CIArotCKDMT100"==name )
    {
      // data information about this continuum:
      // A. Borysow and L. Frommhold, The Astrophysical Journal,
      // Vol. 311, pp.1043-1057, 1986
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_CIArot_n2( pxsec,
                            parameters[0], // scaling factor
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_CIArot_n2( pxsec,
                            0.0,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "N2-CIAfunCKDMT100"==name )
    {
      // data information about this continuum:
      // Lafferty, W.J., A.M. Solodov,A. Weber, W.B. Olson and J._M. Hartmann,
      // Infrared collision-induced absorption by
      // N2 near 4.3 microns for atmospheric applications:
      // Measurements and emprirical modeling,
      // Appl. Optics, 35, 5911-5917, (1996)

      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_CIAfun_n2( pxsec,
                            parameters[0], // scaling factor
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_CIAfun_n2( pxsec,
                            0.0,
                            model,
                            f_grid,
                            abs_p,
                            abs_t,
                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= CO2 continuum ========================================================
  else if ( "CO2-CKD241"==name )
    {
      // data information about this continuum:
      // CKDv2.4.1 model at http://www.rtweb.aer.com/continuum_frame.html
      // This continuum accounts for the far wings of the many COS lines/bands since
      // the line is used with a cutoff in the line shape with +/- 25 cm^-1.
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum strength coefficient [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : continuum temperature exponent  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //     abs_h2o       : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_241_co2( pxsec,
                       parameters[0], // abs. scaling
                       model,
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_241_co2( pxsec,
                       0.00,
                       model,
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "CO2-CKDMT100"==name )
    {
      // data information about this continuum:
      // CKD model at http://www.rtweb.aer.com/continuum_frame.html
      // This continuum accounts for the far wings of the many COS lines/bands since
      // the line is used with a cutoff in the line shape with +/- 25 cm^-1.
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum strength coefficient [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : continuum temperature exponent  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //     abs_h2o       : [1]
      //
      const int Nparam = 1;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          CKD_mt_co2( pxsec,
                      parameters[0], // abs. scaling
                      model,
                      f_grid,
                      abs_p,
                      abs_t,
                      vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          CKD_mt_co2( pxsec,
                      0.00,
                      model,
                      f_grid,
                      abs_p,
                      abs_t,
                      vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "CO2-SelfContPWR93"==name )
    {
      // data information about this continuum:
      // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
      // "Atmospheric Remote Sensing by Microwave Radiometry",
      // John Wiley & Sons, Inc., 1993, ISBN 0-471-62891-3
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum strength coefficient [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : continuum temperature exponent  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Rosenkranz_CO2_self_continuum( pxsec,
                                         parameters[0], // coefficient
                                         parameters[1], // temp. exponent
                                         model,
                                         f_grid,
                                         abs_p,
                                         abs_t,
                                         vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Rosenkranz_CO2_self_continuum( pxsec,
                                         0.00,
                                         0.00,
                                         model,
                                         f_grid,
                                         abs_p,
                                         abs_t,
                                         vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  else if ( "CO2-ForeignContPWR93"==name )
    {
      // data information about this continuum:
      // P. W. Rosenkranz Chapter 2, pp 74, in M. A. Janssen,
      // "Atmospheric Remote Sensing by Microwave Radiometry",
      // John Wiley & Sons, Inc., 1993, ISBN 0-471-62891-3
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : continuum strength coefficient [1/m * 1/(Hz*Pa)²]
      //     parameters[1] : continuum temperature exponent  [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     abs_n2        : [1]
      //     vmr           : [1]
      //
      const int Nparam = 2;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "Continuum model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          Rosenkranz_CO2_foreign_continuum( pxsec,
                                            parameters[0],
                                            parameters[1],
                                            model,
                                            f_grid,
                                            abs_p,
                                            abs_t,
                                            abs_n2,
                                            vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "Continuum model " << name << " requires " << Nparam << " input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "Continuum model " << name << " running with \n"
               << "the parameters for model " << model << ".\n";
          Rosenkranz_CO2_foreign_continuum( pxsec,
                                            0.00,
                                            0.00,
                                            model,
                                            f_grid,
                                            abs_p,
                                            abs_t,
                                            abs_n2,
                                            vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: Continuum model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters. " << "\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 3.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= cloud and fog absorption from MPM93 ==================================
  else if ( "liquidcloud-MPM93"==name )
    {
      // Suspended water droplet absorption parameterization from MPM93 model
      // H. J. Liebe and G. A. Hufford and M. G. Cotton,
      // "Propagation modeling of moist air and suspended water/ice
      //  particles at frequencies below 1000 GHz",
      // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
      // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : [1]
      //     parameters[1] : [1]
      //     parameters[2] : [1]
      //     model        : [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      // liquid water droplet parameters:
      // suspended water droplet density   range: 0-10 g/m³
      // specific droplet weight           value:    1 g/cm³
      //
      // valid atmospheric condition:
      // temperature      : 233 to 323 K
      // relative humidity:   1 to 100 %
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "MPM93 liquid water cloud absorption model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93WaterDropletAbs(pxsec,
                               parameters[0],     // scaling factror
                               parameters[1],     // scaling factror
                               parameters[2],     // scaling factror
                               model,       // model option
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "MPM93 liquid water cloud absorption model " << name << " requires\n"
             << Nparam << " input parameter for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "MPM93 liquid water cloud absorption model " << name << " running with \n"
               << "the parameter for model " << model << ".\n";
          MPM93WaterDropletAbs(pxsec,
                               0.000,        // scaling factror
                               0.000,        // scaling factror
                               0.000,        // scaling factror
                               model,  // model option
                               f_grid,
                               abs_p,
                               abs_t,
                               vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: MPM93 liquid water cloud absorption model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 4.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= ice particle absorption from MPM93 ===================================
  else if ( "icecloud-MPM93"==name )
    {
      // Ice particle absorption parameterization from MPM93 model
      // H. J. Liebe and G. A. Hufford and M. G. Cotton,
      // "Propagation modeling of moist air and suspended water/ice
      //  particles at frequencies below 1000 GHz",
      // AGARD 52nd Specialists Meeting of the Electromagnetic Wave
      // Propagation Panel, Palma de Mallorca, Spain, 1993, May 17-21
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : [1]
      //     parameters[1] : [1]
      //     parameters[2] : [1]
      //     model        : [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [1]
      //
      // ice crystal parameters:
      // suspended water droplet density   range: 0-10 g/m³
      // specific droplet weight           value:    1 g/cm³
      //
      // valid atmospheric condition:
      // temperature      : 233 to 323 K
      // relative humidity:   1 to 100 %
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "MPM93 ice water cloud absorption model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93IceCrystalAbs(pxsec,
                             parameters[0],     // scaling factror
                             parameters[1],     // scaling factror
                             parameters[2],     // scaling factror
                             model,       // model option
                             f_grid,
                             abs_p,
                             abs_t,
                             vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "MPM93 ice water cloud absorption model " << name << " requires \n"
             << Nparam << " input parameter for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "MPM93 ice water cloud absorption model " << name << " running with \n"
               << "the parameter for model " << model << ".\n";
          MPM93IceCrystalAbs(pxsec,
                             0.000,       // scaling factror
                             0.000,       // scaling factror
                             0.000,       // scaling factror
                             model, // model option
                             f_grid,
                             abs_p,
                             abs_t,
                             vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: MPM93 ice water cloud absorption model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 4.\n";
          throw runtime_error(os.str());
        }
    }
  // ============= rain extinction from MPM93 ===========================================
  else if ( "rain-MPM93"==name )
    {
      // Rain extinction parameterization from MPM93 model, described in
      //  H. J. Liebe,
      //  "MPM - An Atmospheric Millimeter-Wave Propagation Model",
      //  Int. J. Infrared and Millimeter Waves, vol. 10(6),
      //  pp. 631-650, 1989
      // and based on
      //  Olsen, R.L., D.V. Rogers, and D. B. Hodge, "The aR^b relation in the
      //  calculation of rain attenuation", IEEE Trans. Antennas Propagat.,
      // vol. AP-26, pp. 318-329, 1978.
      //
      // specific continuum parameters and units:
      //  OUTPUT
      //     pxsec          : [1/m],
      //  INPUT
      //     parameters[0] : [1]
      //     parameters[1] : [1]
      //     parameters[2] : [1]
      //     model         : [1]
      //     f_grid        : [Hz]
      //     abs_p         : [Pa]
      //     abs_t         : [K]
      //     vmr           : [mm/h]
      //
      // rain parameters:
      // rain rate                         range: 0-150 mm/h
      //
      // valid atmospheric condition:
      // temperature      : (preferably above 273 K...)
      //
      const int Nparam = 3;
      if ( (model == "user") && (parameters.nelem() == Nparam) ) // -------------------------
        {
          out3 << "MPM93 rain extinction model " << name << " is running with \n"
               << "user defined parameters according to model " << model << ".\n";
          MPM93RainExt(pxsec,
                       parameters[0],     // scaling factror
                       parameters[1],     // scaling factror
                       parameters[2],     // scaling factror
                       model,             // model option
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr );
        }
      else if ( (model == "user") && (parameters.nelem() != Nparam) ) // --------------------
        {
          ostringstream os;
          os << "MPM93 rain extinction model  " << name << " requires \n"
             << Nparam << " input parameter for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n";
          throw runtime_error(os.str());
        }
      else if ( (model != "user") && (parameters.nelem() == 0) ) // --------------------
        {
          out3 << "MPM93 rain extinction model " << name << " running with \n"
               << "the parameter for model " << model << ".\n";
          MPM93RainExt(pxsec,
                       0.000,       // scaling factror
                       0.000,       // scaling factror
                       0.000,       // scaling factror
                       model,       // model option
                       f_grid,
                       abs_p,
                       abs_t,
                       vmr );
        }
      else if ( (model != "user") && (parameters.nelem() != 0) ) // --------------------
        {
          ostringstream os;
          os << "ERROR: MPM93 rain extinction model " << name << " requires NO input\n"
             << "parameters for the model " << model << ",\n"
             << "but you specified " << parameters.nelem() << " parameters.\n"
             << "This ambiguity can not be solved by arts.\n"
             << "Please see the arts user guide chapter 4.\n";
          throw runtime_error(os.str());
        }
    }
  else // -----------------------------------------------------------------------
    {
      // none of the continuum or full model tags were selected -> error message.
      ostringstream os;
      os << "ERROR: Continuum/ full model tag `" << name << "' not yet implemented in arts!";
      throw runtime_error(os.str());
    }

  // We have to divide the result from the internal continuum model by
  // the number density n to convert it from pseudo cross section to a
  // true cross section.

  // Boltzmann constant
  extern const Numeric BOLTZMAN_CONST;

  // Loop all pressures:
  for ( Index i=0; i<abs_p.nelem(); ++i )
    {
      const Numeric p_i = abs_p[i];
      const Numeric t_i = abs_t[i];

      // Calculate total number density from pressure and temperature.
      // n = n0*T0/p0 * p/T or n = p/kB/t, ideal gas law
      const Numeric n = p_i / BOLTZMAN_CONST / t_i;

      // We add to the output variable xsec here, previous content is
      // not overwritten!
      pxsec(joker,i) /= n;
      xsec(joker,i)  += pxsec(joker,i);
    }
}

// #################################################################################

void check_continuum_model(const String& name)
{
  // The species lookup data:
  extern const Array<SpeciesRecord> species_data;

  // For the list of valid continuum models:
  ArrayOfString valid_models;

  bool found = false;

  // Loop all species:
  for ( Array<SpeciesRecord>::const_iterator i=species_data.begin();
  i<species_data.end();
  ++i )
    {
      String specnam = i->Name();

      // Loop all isotopes:
      for ( Array<IsotopeRecord>::const_iterator j=i->Isotope().begin();
      j<i->Isotope().end();
      ++j )
  {
    String isonam = j->Name();

    // The specified name consists of a species part and an
    // isotope part, e.g., H2O-ContStandardSelf. We need to
    // construct a similar String from the species lookup data
    // by concatenating species name and isotope name.

    String fullnam = specnam + "-" + isonam;
    //    cout << fullnam << "\n";

    // See if this is a continuum tag, so that we can add it to
    // the list:
    if ( 0 > j->Abundance() )
      {
        valid_models.push_back(fullnam);
      }

    if ( name == fullnam )
      {
        found = true;
      }
  }
    }

  // ----------------------------------------------------------------------
  // Have we found it?
  if (!found)
    {
      ostringstream os;
      os << "The String `" << name << "' matches none of the known\n"
   << "continuum models. Known continuum models are:";
      for ( ArrayOfString::const_iterator i=valid_models.begin();
      i<valid_models.end();
      ++i )
  {
    os << "\n" << *i;
  }
      throw runtime_error(os.str());
    }
}
//
//
// #################################################################################
// ############################# f2c code implementation ###########################
// #################################################################################
//
//
// ------------------- begin of f2c.h file --------------------------------
//
/* f2c.h  --  Standard Fortran to C header file */
#ifndef F2C_INCLUDE
#define F2C_INCLUDE

typedef long int integer;
typedef unsigned long int uinteger;
typedef char *address;
typedef short int shortint;
typedef float real;
typedef double doublereal;
typedef struct { real r, i; } complex;
typedef struct { doublereal r, i; } doublecomplex;
typedef long int logical;
typedef short int shortlogical;
typedef char logical1;
typedef char integer1;
#ifdef INTEGER_STAR_8  /* Adjust for integer*8. */
typedef long long longint;    /* system-dependent */
typedef unsigned long long ulongint;  /* system-dependent */
#define qbit_clear(a,b)  ((a) & ~((ulongint)1 << (b)))
#define qbit_set(a,b)  ((a) |  ((ulongint)1 << (b)))
#endif

#define TRUE_ (1)
#define FALSE_ (0)

/* Extern is for use with -E */
#ifndef Extern
#define Extern extern
#endif

/* I/O stuff */

#ifdef f2c_i2
/* for -i2 */
typedef short flag;
typedef short ftnlen;
typedef short ftnint;
#else
typedef long int flag;
typedef long int ftnlen;
typedef long int ftnint;
#endif

/*external read, write*/
typedef struct
{  flag cierr;
  ftnint ciunit;
  flag ciend;
  char *cifmt;
  ftnint cirec;
} cilist;

/*internal read, write*/
typedef struct
{  flag icierr;
  char *iciunit;
  flag iciend;
  char *icifmt;
  ftnint icirlen;
  ftnint icirnum;
} icilist;

/*open*/
typedef struct
{  flag oerr;
  ftnint ounit;
  char *ofnm;
  ftnlen ofnmlen;
  char *osta;
  char *oacc;
  char *ofm;
  ftnint orl;
  char *oblnk;
} olist;

/*close*/
typedef struct
{  flag cerr;
  ftnint cunit;
  char *csta;
} cllist;

/*rewind, backspace, endfile*/
typedef struct
{  flag aerr;
  ftnint aunit;
} alist;

/* inquire */
typedef struct
{  flag inerr;
  ftnint inunit;
  char *infile;
  ftnlen infilen;
  ftnint  *inex;  /*parameters in standard's order*/
  ftnint  *inopen;
  ftnint  *innum;
  ftnint  *innamed;
  char  *inname;
  ftnlen  innamlen;
  char  *inacc;
  ftnlen  inacclen;
  char  *inseq;
  ftnlen  inseqlen;
  char   *indir;
  ftnlen  indirlen;
  char  *infmt;
  ftnlen  infmtlen;
  char  *inform;
  ftnint  informlen;
  char  *inunf;
  ftnlen  inunflen;
  ftnint  *inrecl;
  ftnint  *innrec;
  char  *inblank;
  ftnlen  inblanklen;
} inlist;

#define VOID void

union Multitype {  /* for multiple entry points */
  integer1 g;
  shortint h;
  integer i;
  /* longint j; */
  real r;
  doublereal d;
  complex c;
  doublecomplex z;
  };

typedef union Multitype Multitype;

/*typedef long int Long;*/  /* No longer used; formerly in Namelist */

struct Vardesc {  /* for Namelist */
  char *name;
  char *addr;
  ftnlen *dims;
  int  type;
  };
typedef struct Vardesc Vardesc;

struct Namelist {
  char *name;
  Vardesc **vars;
  int nvars;
  };
typedef struct Namelist Namelist;

#define abs(x) ((x) >= 0 ? (x) : -(x))
#define dabs(x) (doublereal)abs(x)
#define min(a,b) ((a) <= (b) ? (a) : (b))
#define max(a,b) ((a) >= (b) ? (a) : (b))
#define dmin(a,b) (doublereal)min(a,b)
#define dmax(a,b) (doublereal)max(a,b)
#define bit_test(a,b)  ((a) >> (b) & 1)
#define bit_clear(a,b)  ((a) & ~((uinteger)1 << (b)))
#define bit_set(a,b)  ((a) |  ((uinteger)1 << (b)))

/* procedure parameter types for -A and -C++ */

#define F2C_proc_par_types 1
#ifdef __cplusplus
typedef int /* Unknown procedure type */ (*U_fp)(...);
typedef shortint (*J_fp)(...);
typedef integer (*I_fp)(...);
typedef real (*R_fp)(...);
typedef doublereal (*D_fp)(...), (*E_fp)(...);
typedef /* Complex */ VOID (*C_fp)(...);
typedef /* Double Complex */ VOID (*Z_fp)(...);
typedef logical (*L_fp)(...);
typedef shortlogical (*K_fp)(...);
typedef /* Character */ VOID (*H_fp)(...);
typedef /* Subroutine */ int (*S_fp)(...);
#else
typedef int /* Unknown procedure type */ (*U_fp)();
typedef shortint (*J_fp)();
typedef integer (*I_fp)();
typedef real (*R_fp)();
typedef doublereal (*D_fp)(), (*E_fp)();
typedef /* Complex */ VOID (*C_fp)();
typedef /* Double Complex */ VOID (*Z_fp)();
typedef logical (*L_fp)();
typedef shortlogical (*K_fp)();
typedef /* Character */ VOID (*H_fp)();
typedef /* Subroutine */ int (*S_fp)();
#endif
/* E_fp is for real functions when -R is not specified */
typedef VOID C_f;  /* complex function */
typedef VOID H_f;  /* character function */
typedef VOID Z_f;  /* double complex function */
typedef doublereal E_f;  /* real function with -R not specified */

/* undef any lower-case symbols that your C compiler predefines, e.g.: */

#ifndef Skip_f2c_Undefs
#undef cray
#undef gcos
#undef mc68010
#undef mc68020
#undef mips
#undef pdp11
#undef sgi
#undef sparc
#undef sun
#undef sun2
#undef sun3
#undef sun4
#undef u370
#undef u3b
#undef u3b2
#undef u3b5
#undef unix
#undef vax
#endif
#endif

// ------------------- end of f2c.h file --------------------------------


// ------------------ begin of Borysow N2N2 F77 code --------------------


/* n2n2tks.f -- translated by f2c (version 20010821).
   You must link the resulting object file with the libraries:
  -lf2c -lm   (in that order)
*/

/* Common Block Declarations */

struct s_blockin_ {
    double temp, fnumin, fnumax, dnu;
} blockin_;

#define blockin_1 blockin_

struct s_app3a_ {
    double slit, dx, wnrmax3;
} app3a_;

#define app3a_1 app3a_

struct s_app3b_ {
    int nsri, ns, nsriup;
} app3b_;

#define app3b_1 app3b_

struct s_rsilo_ {
    double rsilo[201];
} rsilo_;

#define rsilo_1 rsilo_

struct s_bou43_ {
    int initb;
} bou43_;

#define bou43_1 bou43_

union u_bba_ {
    struct s_m_1 {
  double omeg[201], rsi[201], rsigg[201], alfa;
    } m_1;
    struct s_m_2 {
  double omeg[201], rsi[201], rsigg[201], beta;
    } m_2;
} bba_;

#define bba_1 (bba_.m_1)
#define bba_2 (bba_.m_2)

struct s_bbc_ {
    int nsol;
} bbc_;

#define bbc_1 bbc_

struct s_bf_ {
    double g0bf, delbf, om0;
} bf_;

#define bf_1 bf_

struct like_1_ {
    int like;
    char lgas[5];
};

#define like_1 (*(struct like_1_ *) &like_)

struct s_k1k0_ {
    int ik1k0;
} k1k0_;

#define k1k0_1 k1k0_

struct s_bbb_ {
    int ibound;
} bbb_;

#define bbb_1 bbb_

struct energ_1_ {
    double eb[246]  /* was [41][6] */;
    int niv[6];
};

#define energ_1 (*(struct energ_1_ *) &energ_)

struct s_dimer_ {
    int nlines;
} dimer_;

#define dimer_1 dimer_

struct n2part_1_ {
    double q1, wn2[2], b01, d01;
    int jrange2;
};
struct n2part_2_ {
    double q, wn2[2], b0, d0;
    int jrange1;
};

#define n2part_1 (*(struct n2part_1_ *) &n2part_)
#define n2part_2 (*(struct n2part_2_ *) &n2part_)

union u_bl3_ {
    struct s_m_1 {
  double rsi[401];
    } m_1;
    struct s_m_2 {
  double rsibb[401];
    } m_2;
} bl3_;

#define bl3_1 (bl3_.m_1)
#define bl3_2 (bl3_.m_2)

union u_bbbb_ {
    struct s_m_1 {
  int idelv, iv, ivp, idell, il, ilp;
    } m_1;
    struct s_m_2 {
  int ldelvi, ivi, ivip, ldelel, ll, llp;
    } m_2;
} bbbb_;

#define bbbb_1 (bbbb_.m_1)
#define bbbb_2 (bbbb_.m_2)

/* Initialized data */

struct s_energe_ {
    double e_1[246];
    int e_2[6];
    } energ_ = { {-54.99996, -54.86228, -54.58697, -54.17413, -53.62391,
      -52.93648, -52.11211, -51.15108, -50.05374, -48.82049, -47.45179,
      -45.94815, -44.31014, -42.53841, -40.63365, -38.59665, -36.42824,
      -34.12937, -31.70105, -29.14439, -26.46061, -23.65103, -20.71709,
      -17.66041, -14.48271, -11.18593, -7.77221, -4.24393, -.60374,
      3.14531, 6.99978, 10.95566, 15.00818, 19.15136, 23.37787,
      27.67681, 32.03237, 36.42278, 40.83668, 45.29436, 49.79246,
      -31.89437, -31.77215, -31.52779, -31.16143, -30.67334, -30.06382,
      -29.33328, -28.48222, -27.51123, -26.42099, -25.21229, -23.88603,
      -22.44322, -20.88502, -19.21272, -17.42777, -15.53182, -13.52669,
      -11.41446, -9.1975, -6.87848, -4.46049, -1.94714, .65736, 3.34788,
       6.11816, 8.95978, 11.8613, 14.80383, 17.75924, 20.71774,
      23.71589, 0., 0., 0., 0., 0., 0., 0., 0., 0., -16.05019, -15.9464,
       -15.73896, -15.42815, -15.0144, -14.4983, -13.88057, -13.16213,
      -12.34407, -11.42771, -10.41455, -9.30639, -8.10531, -6.81376,
      -5.43459, -3.97121, -2.42768, -.80899, .87859, 2.62689, 4.42334,
      6.24733, 8.06983, 9.90464, 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
       0., 0., 0., 0., 0., 0., 0., -6.49343, -6.41131, -6.24732,
      -6.00202, -5.67623, -5.27111, -4.78813, -4.22919, -3.59665,
      -2.89345, -2.12325, -1.29074, -.40202, .5345, 1.50455, 2.48212,
      3.46665, 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., -1.76583, -1.70887,
      -1.59552, -1.427, -1.20523, -.93302, -.61434, -.25504, .13641, 0.,
       0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      -.17133, -.14341, 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.}, {41, 32, 24, 17, 9, 2} }
      ;

struct s_n2part_ {
    double fill_1[1];
    double e_2[4];
    int fill_3[1];
    } n2part_ = { {0}, {2., 1., 1.98957, 5.8e-6}, {0} };

struct s_like_ {
    int fill_1[1];
    char e_2[5];
    } like_ = { {0}, "N2N2" };


/* Table of constant values */

// FIXME static integer c__9 = 9;
// FIXME static integer c__1 = 1;
// FIXME static integer c__5 = 5;
static int cs__1 = 1;
static int cs__0 = 0;
static double c_b24 = 2.9723;
static double c_b25 = -.99569;
static double c_b26 = .09464;
static double c_b27 = 1.2962e-12;
static double c_b28 = -.13048;
static double c_b29 = -.03128;
static double c_b30 = 3.7969e-14;
static double c_b31 = 1.03681;
static double c_b32 = -.14336;
static int cs__2 = 2;
static int cs__3 = 3;
static double c_b43 = .180926;
static double c_b44 = -1.69153;
static double c_b45 = .18605;
static double c_b46 = .3;
static double c_b47 = 0.;
static double c_b49 = 6.6017e-16;
static double c_b50 = 2.59982;
static double c_b51 = -.31831;
static double c_b52 = 1.2481e-12;
static double c_b53 = -.57028;
static double c_b54 = .05983;
static double c_b55 = 5.2681e-13;
static double c_b56 = -.24719;
static double c_b57 = .00519;
static double c_b58 = 2.7518e15;
static double c_b59 = -25.38969;
static double c_b60 = 2.46542;
static int cs__4 = 4;
static int cs__5 = 5;
// FIXME static integer c__2 = 2;
static double c_b78 = .0825299;
static double c_b79 = -1.25562;
static double c_b80 = .12981;
static double c_b84 = 3.6611e-15;
static double c_b85 = 1.47688;
static double c_b86 = -.16537;
static double c_b87 = 6.1264e-10;
static double c_b88 = -2.25011;
static double c_b89 = .15289;
static double c_b90 = 7.982e-10;
static double c_b91 = -2.76152;
static double c_b92 = .21847;
static double c_b93 = 5.2868e-22;
static double c_b94 = 7.66253;
static double c_b95 = -.77527;
static double c_b112 = 119.261;
static double c_b113 = -3.78587;
static double c_b114 = .34024;
static double c_b115 = 9.3777e-12;
static double c_b116 = -.66548;
static double c_b117 = .0033;
static double c_b118 = 3.0395e-13;
static double c_b119 = .24728;
static double c_b120 = -.06607;
static double c_b183 = 1e-6;
static double c_b186 = 1.5;

#define temp (blockin_1.temp)
#define fnumin (blockin_1.fnumin)
#define fnumax (blockin_1.fnumax)
#define dnu (blockin_1.dnu)
#define slit (app3a_1.slit)
#define dx (app3a_1.dx)
#define rsilo (rsilo_1.rsilo)
#define omeg (bba_1.omeg)
#define rsi (bba_1.rsi)
#define rsigg (bba_1.rsigg)
#define nsol (bbc_1.nsol)
#define like (like_1.like)
#define ik1k0 (k1k0_1.ik1k0)
#define ibound (bbb_1.ibound)

/* TKS ****** SUBROUTINE N2N2TKS(T, F) ***************************************/
Numeric n2n2tks_(double t, double f)
{
    /* System generated locals */
    int s__1;
    double ret_val;

    /* Local variables */
    double hexa[10], quad[10], freq[10], e;
    int i__;
    double s, x, t1, t2, t3, t4;
    int ij, nf, jj;
    double rslow1, si;
    int nr;
    double ss[1], tt[2];
    extern /* Subroutine */ int bound32_(double *, double *, int
      *), bound54_(double *, double *, int *);
    double tksabs[5];
    extern /* Subroutine */ int spline_(int *, int *, int *,
      double *, double *, double *, double *,
      double *, double *, int *, double *);
    double dtrans[10], abscoef[10];
    extern /* Subroutine */ int addspec_(double *, double *,
      double *, double *, double *, double *,
      double *, int *, double *, double *, int *,
      int *, int *, int *, int *, int *);
    double eps, alfatot[10];
    extern /* Subroutine */ int partsum_(double *);

/*     ========================================= */
/*     Copyright (C) Aleksandra Borysow, 1987) */
/*     ==================================================================== */
/*     PROGRAM PREPARED BY ALEKSANDRA BORYSOW (APRIL'1987) */
/*     (UNIVERSITY OF TEXAS AT AUSTIN, PHYSICS DEPARTMENT) */
/*     ORIGINAL VERSION: WRITTEN ON CYBER */

/*     PROGRAM GENERATES N2-N2 COLLISION-INDUCED SPECTRA AT */
/*     TEMPERATURES BETWEEN 50 TO 300 K. */
/*     CIA SPECTRA MODELED AFTER PAPER (*) */
/*     ALEKSANDRA BORYSOW AND LOTHAR FROMMHOLD, */
/*     ASTROPHYSICAL JOURNAL, VOL. 311, PAGES 1043-1057, (1986) */

/*     REVISED BY GLENN ORTON (1989) - TO WORK ON SUN WORKSTATIONS */
/*     AND ON THE VAX MACHINES (FORTRAN-77) */
/*     PASSES STANDARD TEST ON SUN, AT 200K (JULY 1992) */
/*     ==================================================================== */

/*     ALSO IN REVISION: DOUBLE PRECISION FOR ALL F.P. VARIABLES */

/*     ==================================================================== */

/*     HISTORY: */

/*     2001-02-28 THOMAS KUHN: */
/*     CHANGE OF LINES */
/*       RSILO(I)=DLOG(RSI(I)*1.E80) */
/*     TO */
/*       RSILO(I)=(DLOG(RSI(I))+80.0D0*DLOG(10.0D0)) */
/*     BECAUSE OF OVERFLOW PROBLEMS. */
/*     COSMETICS FOR THE CODE TO BE FASTER READABLE. */
/*     CHANGE OF OUTPUT FILE NAME. */
/*     CHANGE OF OUTPUT FILE CONTENT */

/*     ==================================================================== */

/* TKS*      IMPLICIT REAL*8 (A-H,O-Z) */

/* TKS  INPUT/OUTPUT VARIABLES */
/*      REAL T, F */

    ret_val = 0.;

/*     TEMP   = TEMPERATURE IN KELVIN, SHOULD BE BETWEEN 50. AND 300. */
/*     FNUMIN = LOWEST FREQUENCY IN CM-1, FOR LISTING OF ALPHA(FNU) */
/*     FNUMAX = HIGHEST FREQUENCY IN CM-1, FOR LISTING OF ALPHA(FNU) */
/*     LINE SHAPE MODELLING WILL BE MOST ACCURATE WITHIN RANGE OF */
/*     R-T SPECTRAL INTENSITIES AS 1:100. */
/*     DNU    = FREQUENCY INCREMENT IN CM-1. DNU SHOULD BE CHOSEN SO */
/*              THAT NOT MORE THAN 10 STEPS ARE NEEDED TO GO FROM */
/*              FNUMIN TO FNUMAX (ELSE ARRAY DIMENSIONS OF FREQ,ABSCOEF */
/*              MUST BE ADJUSTED IN ADDEM). */


/*        USER: */
/*       ----- */
/*   EDIT ONLY HERE: TEMP (K), MIN. FREQ. (CM^-1)= FNUMIN, */
/*   MAX. FREQ. =  FNUMAX, STEP = DNU, SLITWIDTH (CM^-1)=SLIT */
/*   (SLIT=4.3 IS EQUIVALENT TO THAT OF VOYAGER SPECTRA, ONLY BOUND BOUND */
/*   SPECTRA ARE CONVOLUTED WITH THIS SLITWIDTH, THE FREE FREE SPECTRA */
/*   ARE FAR TOO BROAD FOR THE SLITWIDTH FUNCTION TO MATTER, */
/*   LEAVE LIKE = 1 (FOR LIKE PAIRS,  AS N2-N2) */
/*   THE PROGRAM WILL ASSUME EQUILIBRIUM N2, */
/*   ALLOWED TEMPERATURE RANGE: 50-300K (DO NOT  EXTEND IT BEYOND THESE LIMITS!) */
/*   IF QUESTIONS: CONTACT ABORYSOW@NBI.DK */
/* TKS*      NF=INT((FNUMAX-FNUMIN)/DNU+0.5)+1 */
/* TKS*      IF (NF.GT.10) NF=10 */
/* TKS*      FNUMAX=FNUMIN+FLOAT(NF-1)*DNU */

/* TKS  INPUT TEMPERATURE (K) CHECK OF RANGE */
    if (t < 50. || t > 300.) {
      ostringstream os;
      os  << "out of T range ( 50<T<300)! return without calc.!" <<"\n";
      throw runtime_error(os.str());
      goto L999;
    }
    temp = t;

/*     *********************** INPUT DATA FROM USER *********************** */
/*     FNUMIN = MINIMUM FREQENCY [CM^-1] */
    fnumin = f / 29979245800.;
/*     FNUMAX = MAXIMUM FREQENCY [CM^-1] */
    fnumax = fnumin;
/*     ONLY ONE FREQUENCY PER CALL */
    nf = 1;
/*     DEFAULT VALUE OF FREQUENCY STEP [CM^-1] */
    dnu = 10.;
/*     DEFAULT VALUE */
    like = 1;
/*     SLIT = SLITWIDTH [CM^-1] */
/*     SLIT=4.3 IS EQUIVALENT TO THAT OF VOYAGER SPECTRA, ONLY BOUND BOUND */
/*     SPECTRA ARE CONVOLUTED WITH THIS SLITWIDTH, THE FREE FREE SPECTRA */
/*     ARE FAR TOO BROAD FOR THE SLITWIDTH FUNCTION TO MATTER. */
    slit = 4.3;
/*     ******************************************************************** */

/* TKS*      WRITE (6,14) LGAS,TEMP,FNUMIN,FNUMAX,DNU,NF-1 */
/* TKS*14    FORMAT(' ABSORPTION SPECTRA OF ',A5,' AT',F8.1,' K'/ */
/* TKS*     $   1X,43(1H=),/ */
/* TKS*     1' MIN.FREQ.=',F8.1,' CM-1',10X,'MAX.FREQ.=',F8.1,' CM-1',10X, */
/* TKS*     2'FREQ.INCREMENT=',F8.2,' CM-1',5X,'IN',I5,' STEPS'//) */


    partsum_(&temp);


/*     THE N2-N2 SPECTRA   FOR 50-300K */
/*     ================================ */

    x = log(temp);
    s__1 = nf;
    for (i__ = 1; i__ <= s__1; ++i__) {
/*         FREQ(I)=FNUMIN+FLOAT(I-1)*DNU */
  freq[i__ - 1] = fnumin;
  alfatot[i__ - 1] = 0.;
/* L10: */
  abscoef[i__ - 1] = 0.;
    }


/*    ==================================================================== */


    jj = 1;
L442:
/* L1023: */
    ++jj;
    if (jj == 42) {
  goto L444;
    }
    goto L442;
/*     EB(JJ,IV) JJ-ROTATIONAL LEVEL "L", IV- VIBRATIONAL LEVEL "V"; */
L444:



/*     ==================================================================== */

/*     QUADRUPOLAR INDUCTION: (50-300K) LAMBDA1,LAMBDA2,LAMBDA,L=2023&0223 */
/*     ------------------------------------------------------------------- */

    eps = 1e-5;
    tt[0] = 10.;
    bound32_(&temp, rsi, &nsol);
    ij = 0;
    rslow1 = 0.;
    s__1 = nsol;
    for (i__ = 1; i__ <= s__1; ++i__) {
  ++ij;
/*        MOD CAN BE ONLY 0 OR 1 OR 2 */
  if (ij % 3 == 0) {
      rslow1 = 1.5e-60;
  }
  if (ij % 3 == 1) {
      rslow1 = 1.7e-60;
  }
  if (ij % 3 == 2) {
      rslow1 = 1.6e-60;
  }
  if (rsi[i__ - 1] < 1e-60) {
      rsi[i__ - 1] = rslow1;
  }
/* TKS*      RSILO(I)=DLOG(RSI(I)*1.D80) */
  rsilo[i__ - 1] = log(rsi[i__ - 1]) + log(10.) * 80.;
  omeg[i__ - 1] = (double) (i__ - 1) * dx;
/* L88: */
    }

/* L9991: */

    spline_(&nsol, &cs__1, &cs__0, &eps, omeg, rsilo, tt, ss, &si, &nr, rsigg)
      ;

    ik1k0 = 1;
    ibound = 1;
/*       B-C LINESHAPE HERE */
/*       THESE VALUES (S,T1,T2) REPLACE VALUES GIVEN IN PAPER (*): */
/*       PUBLISHED IN AN ERRATUM, ASTROPHYSICAL JOURNAL, VOL.320, P.437 */
/*       (1987) */
    s = c_b24 * exp((c_b26 * x + c_b25) * x);
    t1 = c_b27 * exp((c_b29 * x + c_b28) * x);
    t2 = c_b30 * exp((c_b32 * x + c_b31) * x);
    e = 0.;
    t3 = 0.;
    t4 = 0.;

    addspec_(&s, &e, &t1, &t2, &t3, &t4, &temp, &nf, freq, abscoef, &cs__0, &
      like, &cs__2, &cs__0, &cs__2, &cs__3);
    s__1 = nf;
    for (i__ = 1; i__ <= s__1; ++i__) {
  quad[i__ - 1] = abscoef[i__ - 1];
/* L20: */
  alfatot[i__ - 1] = abscoef[i__ - 1] + alfatot[i__ - 1];
    }



/*     ==================================================================== */

/*     HEXADECAPOLE COMPONENTS: LAMBDA1,LAMBDA2,LAMBDA,L=4045&0445 */
/*     ----------------------------------------------------------- */

    bound54_(&temp, rsi, &nsol);
    ij = 0;
    s__1 = nsol;
    for (i__ = 1; i__ <= s__1; ++i__) {
  ++ij;
/*     MOD CAN BE ONLY 0 OR 1 OR 2 */
  if (ij % 3 == 0) {
      rslow1 = 1.5e-60;
  }
  if (ij % 3 == 1) {
      rslow1 = 1.7e-60;
  }
  if (ij % 3 == 2) {
      rslow1 = 1.6e-60;
  }
  if (rsi[i__ - 1] < 1e-60) {
      rsi[i__ - 1] = rslow1;
  }
/* TKS         RSILO(I)=DLOG(RSI(I)*1.E80) */
  rsilo[i__ - 1] = log(rsi[i__ - 1]) + log(10.) * 80.;
/* L111: */
  omeg[i__ - 1] = (double) (i__ - 1) * dx;
    }
    spline_(&nsol, &cs__1, &cs__0, &eps, omeg, rsilo, tt, ss, &si, &nr, rsigg)
      ;

/*     --------------------------- */
/*       TEMPERATURES 50-140K */
/*     --------------------------- */

    if (temp >= 140.) {
  goto L333;
    }

    s = c_b43 * exp((c_b45 * x + c_b44) * x);
    e = c_b46 * exp((c_b47 * x + c_b47) * x);
    t1 = c_b49 * exp((c_b51 * x + c_b50) * x);
    t2 = c_b52 * exp((c_b54 * x + c_b53) * x);
    t3 = c_b55 * exp((c_b57 * x + c_b56) * x);
    t4 = c_b58 * exp((c_b60 * x + c_b59) * x);

    ik1k0 = 0;
    ibound = 1;
    addspec_(&s, &e, &t1, &t2, &t3, &t4, &temp, &nf, freq, abscoef, &cs__0, &
      like, &cs__4, &cs__0, &cs__4, &cs__5);
    s__1 = nf;
    for (i__ = 1; i__ <= s__1; ++i__) {
  hexa[i__ - 1] = abscoef[i__ - 1];
  /*
    s_wsle(&io___25);
    do_lio(&c__9, &c__1, " T=50-140K: HEXA(", (ftnlen)17);
    do_lio(&c__2, &c__1, (char *)&i__, (ftnlen)sizeof(int));
    do_lio(&c__9, &c__1, ") =", (ftnlen)3);
    do_lio(&c__5, &c__1, (char *)&abscoef[i__ - 1], (ftnlen)sizeof(
    double));
    e_wsle();
  */
/* L50: */
  alfatot[i__ - 1] += abscoef[i__ - 1];
    }
    goto L334;

/*     --------------------------- */
/*       TEMPERATURES 140-300K */
/*     --------------------------- */

L333:
    ik1k0 = 0;
    ibound = 1;
    s = c_b78 * exp((c_b80 * x + c_b79) * x);
    e = c_b46 * exp((c_b47 * x + c_b47) * x);
    t1 = c_b84 * exp((c_b86 * x + c_b85) * x);
    t2 = c_b87 * exp((c_b89 * x + c_b88) * x);
    t3 = c_b90 * exp((c_b92 * x + c_b91) * x);
    t4 = c_b93 * exp((c_b95 * x + c_b94) * x);

    addspec_(&s, &e, &t1, &t2, &t3, &t4, &temp, &nf, freq, abscoef, &cs__0, &
      like, &cs__4, &cs__0, &cs__4, &cs__5);
    s__1 = nf;
    for (i__ = 1; i__ <= s__1; ++i__) {
  hexa[i__ - 1] = abscoef[i__ - 1];
  /*
    s_wsle(&io___26);
    do_lio(&c__9, &c__1, " T=140-300K: HEXA(", (ftnlen)18);
    do_lio(&c__2, &c__1, (char *)&i__, (ftnlen)sizeof(int));
    do_lio(&c__9, &c__1, ") =", (ftnlen)3);
    do_lio(&c__5, &c__1, (char *)&abscoef[i__ - 1], (ftnlen)sizeof(
    double));
    e_wsle();
  */
/* L550: */
  alfatot[i__ - 1] += abscoef[i__ - 1];
    }

/*     ==================================================================== */

/*     DOUBLE TRANSITIONS: LAMBDA1,LAMBDA2,LAMBDA,L=2,2,3,3 */
/*     ---------------------------------------------------- */

/*     --------------------------- */
/*       TEMPERATURES 50-300K */
/*     --------------------------- */

L334:
    ik1k0 = 1;
    ibound = 0;
/* X        S=Y(X,1.19261D-58, -3.78587,0.34024) */
    s = c_b112 * exp((c_b114 * x + c_b113) * x);
    t1 = c_b115 * exp((c_b117 * x + c_b116) * x);
    t2 = c_b118 * exp((c_b120 * x + c_b119) * x);
    t3 = 0.;
    t4 = 0.;
    addspec_(&s, &e, &t1, &t2, &t3, &t4, &temp, &nf, freq, abscoef, &cs__0, &
      like, &cs__2, &cs__2, &cs__3, &cs__3);
    s__1 = nf;
    for (i__ = 1; i__ <= s__1; ++i__) {
  dtrans[i__ - 1] = abscoef[i__ - 1];
/* L650: */
  alfatot[i__ - 1] += abscoef[i__ - 1];
    }

/*     ==================================================================== */

/*     ANISOTROPIC OVERLAP NEGLECTED (LAMBDA1,LAMBDA2,LAMBDA,L=0212) */
/*     SINCE THIS TERM IS EXTREMELY SMALL */

/*     ==================================================================== */

/* TKS*      PRINT 154, FREQ(1),FREQ(NF),FREQ(2)-FREQ(1),TEMP */
/* TKS*      PRINT 156, (ALFATOT(I),I=1,NF) */
/* TKS*154   FORMAT(///' ABSORPTION COEFFICIENT ALPHA(FNU), FROM ',F5.1, */
/* TKS*     $' CM-1 TO',F7.1,' CM-1, AT',F6.2,' CM-1 INCREMENTS, AT T=', */
/* TKS*     $F7.2,' K, IN UNITS OF CM-1 AMAGAT-2'/) */
/* TKS*156   FORMAT(' ',10D13.5) */
/* TKS*  OPEN(UNIT=10, FILE='OUT', STATUS='UNKNOWN') */
/* TKS*  WRITE(10, 2929) (FREQ(I), ALFATOT(I), I=1, NF) */
/* TKS*C  WRITE(10, 2929) (FREQ(I), QUAD(I), HEXA(I) ALFATOT(I), I=1, NF) */
/* TKS*2929  FORMAT(F10.3, E12.4) */

/* TKS*      STOP */



/* TKS FILL OUTPUT VARIABLE */
    tksabs[0] = quad[0];
    tksabs[1] = hexa[0];
    tksabs[2] = dtrans[0];
    tksabs[3] = alfatot[0];
    ret_val = alfatot[0];
/* TKS      print*,'QUAD(1),HEXA(1),DTRANS(1)=',QUAD(1),HEXA(1),DTRANS(1) */
L999:
    return ret_val;
} /* n2n2tks_ */

#undef temp
#undef fnumin
#undef fnumax
#undef dnu
#undef slit
#undef dx
#undef rsilo
#undef omeg
#undef rsi
#undef rsigg
#undef nsol
#undef like
#undef ik1k0
#undef ibound

#define wnrmax3 (app3a_1.wnrmax3)
#define rsilo (rsilo_1.rsilo)
#define omeg (bba_2.omeg)
#define rsigg (bba_2.rsigg)
#define beta (bba_2.beta)
#define nsol (bbc_1.nsol)
#define ibound (bbb_1.ibound)
#define q1 (n2part_1.q1)
#define wn2 (n2part_1.wn2)
#define b01 (n2part_1.b01)
#define d01 (n2part_1.d01)
#define jrange2 (n2part_1.jrange2)



/* ########################################################################## */


/* Subroutine */ int addspec_(double *g0, double *ep, double *
  tau1, double *tau2, double *tau5, double *tau6,
  double *temp, int *nf, double *freq, double *abscoef,
   int * /* mp */, int *like, int *lambda1, int *lambda2,
  int *lambda, int * /* lvalue */)
{
    /* Initialized data */

    static double closchm = 2.68675484e19;
    static double boltzwn = .6950304;
    static double hbar = 1.054588757e-27;
    static double pi = 3.1415926535898;
    static double clight = 2.997925e10;

    /* Format strings */
    /*
    static char fmt_20[] = "(/\002 LAMBDA1,LAMBDA2, LAMBDA,LVALUE=\002,2i3,2"
      "x,2i3,\002 COMPONENT.\002/15x,\002LINE SHAPE PARAMETERS:\002,6d1"
      "2.3,5x,\002G(0)=\002,d12.3/)";
    */

    /* System generated locals */
    int s__1, s__2, s__3, s__4, s__5, s__6;
    double d__1, d__2;

    /* Builtin functions */
    /*
    integer s_wsfe(cilist *), do_fio(integer *, char *, ftnlen), e_wsfe(void),
       s_wsle(cilist *), do_lio(integer *, integer *, char *, ftnlen),
      e_wsle(void);
    */

    /* Local variables */
    int list, jsum;
    extern double bgama_(double *, double *, double *,
      double *, double *, double *, double *);
    int i__, j;
    double calib, p;
    int i1, j1, i2, j2;
    double p1, p2, omega1, omega2;
    int ip, jp, iq;
    double twopic;
    int jplusl, ip1, jp1, ip2, jp2;
    double fac, cgs, xbg, wkf, frq, wki;
    extern double specfct_(double *, double *, double *,
      double *, int *, double *), clebsqr_(int *,
      int *, int *);
    double cg1s, cg2s;

    /* Fortran I/O blocks */
    /*
    static cilist io___38 = { 0, 6, 0, fmt_20, 0 };
    static cilist io___40 = { 0, 6, 0, 0, 0 };
    */


/*     THIS PROGRAM GENERATES LISTING OF R-T CIA  ALFA(OMEGA) */
/*     IF EITHER LAMBDA1 OR LAMBDA2 EQUAL TO ZERO - SINGLE TRANSITIONS; */
/*     DOUBLE TRANSITIONS ARE ASSUMED OTHERWISE. */
/*     LIKE=1 FOR LIKE SYSTEMS (AS H2-H2), SET LIKE=0 ELSE. */

/*     COMMON/BB/OMEG(201),RSI(201),RSIGG(201),NSOL,BETA */
/*     COMMON/APP3/SLIT,DX,NSRI,WNRMAX3,NS,NSRIUP */
/*     DIMENSION ABSCOEF(NF),FREQ(NF) */
    /* Parameter adjustments */
    --abscoef;
    --freq;

    /* Function Body */

    twopic = 2. * pi * clight;
    if (*like != 1) {
  *like = 0;
    }
/*        TAKE CARE OF FACTOR OF 1.E-60 HERE. */
/* Computing 2nd power */
    d__1 = pi;
/* Computing 2nd power */
    d__2 = closchm * 1e-30;
    calib = twopic * (d__1 * d__1 * 4. / (hbar * 3. * clight)) * (d__2 * d__2)
      ;
    calib /= (double) (*like + 1);
    beta = 1. / (boltzwn * *temp);
    list = *nf;
    s__1 = list;
    for (i__ = 1; i__ <= s__1; ++i__) {
/* L88: */
  abscoef[i__] = 0.;
    }

/*     ROTATIONAL SPECTRUM FOR THE DETAILED LISTING   ******************* */
    /*
      s_wsfe(&io___38);
      do_fio(&c__1, (char *)&(*lambda1), (ftnlen)sizeof(int));
      do_fio(&c__1, (char *)&(*lambda2), (ftnlen)sizeof(int));
      do_fio(&c__1, (char *)&(*lambda), (ftnlen)sizeof(int));
      do_fio(&c__1, (char *)&(*lvalue), (ftnlen)sizeof(int));
      do_fio(&c__1, (char *)&(*g0), (ftnlen)sizeof(double));
      do_fio(&c__1, (char *)&(*ep), (ftnlen)sizeof(double));
      do_fio(&c__1, (char *)&(*tau1), (ftnlen)sizeof(double));
      do_fio(&c__1, (char *)&(*tau2), (ftnlen)sizeof(double));
      do_fio(&c__1, (char *)&(*tau5), (ftnlen)sizeof(double));
      do_fio(&c__1, (char *)&(*tau6), (ftnlen)sizeof(double));
      d__1 = *g0 * bgama_(&c_b47, tau1, tau2, ep, tau5, tau6, temp);
      do_fio(&c__1, (char *)&d__1, (ftnlen)sizeof(double));
      e_wsfe();
    */
    if (*lambda1 == 0 || *lambda2 == 0) {
  goto L152;
    }
    jplusl = jrange2 + max(*lambda1,*lambda2);

    /*
      s_wsle(&io___40);
      do_lio(&c__9, &c__1, "LAMBDA1,LAMBDA2,ABSCOEF(1)=", (ftnlen)27);
      do_lio(&c__2, &c__1, (char *)&(*lambda1), (ftnlen)sizeof(int));
      do_lio(&c__2, &c__1, (char *)&(*lambda2), (ftnlen)sizeof(int));
      do_lio(&c__5, &c__1, (char *)&abscoef[1], (ftnlen)sizeof(double));
      e_wsle();
    */
    jsum = 0;
    s__1 = jrange2;
    for (i1 = 1; i1 <= s__1; ++i1) {
  j1 = i1 - 1;
  s__2 = jplusl;
  for (ip1 = 1; ip1 <= s__2; ++ip1) {
      jp1 = ip1 - 1;
      cg1s = clebsqr_(&j1, lambda1, &jp1);
      if (cg1s <= 0.) {
    goto L150;
      } else {
    goto L130;
      }
L130:
      s__3 = j1 * (j1 + 1);
      p1 = (double) (2 * j1 + 1) * wn2[1 + j1 % 2 - 1] * exp(
        -1.4387859 / *temp * ((b01 - (double) s__3 * d01) * (
        double) s__3)) / q1;
      ++jsum;
      s__3 = jp1 * ip1;
      s__4 = j1 * i1;
      omega1 = (b01 - (double) s__3 * d01) * (double) s__3 - (
        b01 - (double) s__4 * d01) * (double) s__4;
      s__3 = jrange2;
      for (i2 = 1; i2 <= s__3; ++i2) {
    j2 = i2 - 1;
    s__4 = jplusl;
    for (ip2 = 1; ip2 <= s__4; ++ip2) {
        jp2 = ip2 - 1;
        cg2s = clebsqr_(&j2, lambda2, &jp2);
        if (cg2s <= 0.) {
      goto L148;
        } else {
      goto L132;
        }
L132:
        s__5 = j2 * (j2 + 1);
        p2 = (double) (2 * j2 + 1) * wn2[1 + j2 % 2 - 1] *
          exp(-1.4387859 / *temp * ((b01 - (double)
          s__5 * d01) * (double) s__5)) / q1;
        s__5 = jp2 * ip2;
        s__6 = j2 * i2;
        omega2 = (b01 - (double) s__5 * d01) * (double)
          s__5 - (b01 - (double) s__6 * d01) * (
          double) s__6;
        fac = calib * p1 * p2 * cg1s * cg2s;
        s__5 = list;
        for (i__ = 1; i__ <= s__5; ++i__) {
      frq = freq[i__] - omega1 - omega2;
      wki = freq[i__] * (1. - exp(-beta * freq[i__]));
      wkf = wki * fac;
      xbg = *g0 * bgama_(&frq, tau1, tau2, ep, tau5, tau6,
        temp);
      if (ibound == 0) {
          goto L555;
      }
      if (abs(frq) <= wnrmax3) {
          xbg += specfct_(&frq, omeg, rsilo, rsigg, &nsol, &
            beta);
      }
L555:
      abscoef[i__] += xbg * wkf;
/* L146: */
        }
L148:
        ;
    }
      }
L150:
      ;
  }
    }
    goto L2222;
/*     SINGLE TRANSITIONS AT NITROGEN'S ROTATIONAL FREQUENCIES */
/*     ======================================================= */
L152:
    jplusl = jrange2 + *lambda;
    s__2 = jrange2;
    for (i__ = 1; i__ <= s__2; ++i__) {
  j = i__ - 1;
  s__1 = jplusl;
  for (ip = 1; ip <= s__1; ++ip) {
      jp = ip - 1;
      cgs = clebsqr_(&j, lambda, &jp);
      if (cgs <= 0.) {
    goto L200;
      } else {
    goto L210;
      }
L210:
      s__4 = j * (j + 1);
      p = (double) (2 * j + 1) * wn2[1 + j % 2 - 1] * exp(
        -1.4387859 / *temp * ((b01 - (double) s__4 * d01) * (
        double) s__4)) / q1;
      ++jsum;
      s__4 = jp * ip;
      s__3 = j * i__;
      omega1 = (b01 - (double) s__4 * d01) * (double) s__4 - (
        b01 - (double) s__3 * d01) * (double) s__3;
      fac = calib * p * cgs;
      s__4 = list;
      for (iq = 1; iq <= s__4; ++iq) {
    frq = freq[iq] - omega1;
/*               XWKI=FREQ(IQ)*(1.-EXP(-BETA*FREQ(IQ))) */
    wki = freq[iq] * (1. - exp(-beta * freq[iq]));
    wkf = wki * fac;
    xbg = *g0 * bgama_(&frq, tau1, tau2, ep, tau5, tau6, temp);
    if (ibound == 0) {
        goto L444;
    }
    if (abs(frq) <= wnrmax3) {
        xbg += specfct_(&frq, omeg, rsilo, rsigg, &nsol, &beta);
    }
L444:
    abscoef[iq] += xbg * wkf;
/* L199: */
      }
L200:
      ;
  }
    }

L2222:
/* TKS 2222   PRINT 44,(ABSCOEF(I),I=1,LIST) */
/* L44: */
    return 0;
} /* addspec_ */

#undef wnrmax3
#undef rsilo
#undef omeg
#undef rsigg
#undef beta
#undef nsol
#undef ibound
#undef q1
#undef wn2
#undef b01
#undef d01
#undef jrange2

#define q (n2part_2.q)
#define wn2 (n2part_2.wn2)
#define b0 (n2part_2.b0)
#define d0 (n2part_2.d0)
#define jrange1 (n2part_2.jrange1)

/* Subroutine */ int partsum_(double *temp)
{
    /* System generated locals */
    int s__1;

    /* Local variables */
    int j;
    double dq;

/*     N2 ROTATIONAL PARTITION SUM Q = Q(T). */



/*     Q,B0,D0,WN2 - PARTITION FCT., ROT.CONSTANTS, WEIGHTS FOR N2 */
    q = 0.;
    j = 0;
L50:
    s__1 = j * (j + 1);
    dq = (double) (2 * j + 1) * wn2[1 + j % 2 - 1] * exp(-1.4387859 * ((
      b0 - (double) s__1 * d0) * (double) s__1) / *temp);
    q += dq;
    ++j;
    if (dq > q / 900.) {
  goto L50;
    }
    jrange1 = j;
/* TKS      PRINT 30, Q, JRANGE1 */

/* L30: */
    return 0;
} /* partsum_ */

#undef q
#undef wn2
#undef b0
#undef d0
#undef jrange1

#define slit (app3a_1.slit)
#define dx (app3a_1.dx)
#define wnrmax3 (app3a_1.wnrmax3)
#define nsri (app3b_1.nsri)
#define ns (app3b_1.ns)
#define nsriup (app3b_1.nsriup)
#define rsi (bl3_1.rsi)

/* Subroutine */ int profile_(double *x, double *y)
{
    /* System generated locals */
    int s__1;

    /* Local variables */
    int i__;
    double slope;
    int n1;
    double x0;
    int nc;
    double dr;
    int no;
    double xi;
    int nu;

/*     A TRIANGULAR SLIT FUNCTION IS USED. */


/*     COMMON/APP3/SLIT,DX,NSRI,WNRMAX3,NS,NSRIUP */

    if (*y < 0.) {
  goto L105;
    } else if (*y == 0) {
  goto L106;
    } else {
  goto L1;
    }
L1:
    x0 = nsri + 1. + *x / dx;
    nc = (int) x0;
    n1 = nc + 1;
    slope = *y / slit;
    nu = (int) (x0 - ns);
    if (nu < 1) {
  nu = 1;
    }
    if (nu > nsriup) {
  return 0;
    }
    no = (int) (x0 + ns);
    if (no > nsriup) {
  no = nsriup;
    }
    if (no < 1) {
  return 0;
    }
    if (nc > nsriup) {
  nc = nsriup;
    }
    if (nc <= 1) {
  goto L101;
    }
    s__1 = nc;
    for (i__ = nu; i__ <= s__1; ++i__) {
  xi = (i__ - 1.) * dx - wnrmax3;
  dr = slope * (xi - (*x - slit));
  if (dr <= 0.) {
      goto L100;
  }
  rsi[i__ - 1] += dr;
L100:
  ;
    }
L101:

    if (nc >= nsriup) {
  return 0;
    }
    if (n1 < 1) {
  n1 = 1;
    }
    s__1 = no;
    for (i__ = n1; i__ <= s__1; ++i__) {
  xi = (i__ - 1.) * dx - wnrmax3;
  dr = *y - slope * (xi - *x);
  if (dr <= 0.) {
      goto L102;
  }
  rsi[i__ - 1] += dr;
L102:
  ;
    }
    return 0;
L105:
/* TKS  105 PRINT 10,SLIT */
/* TKS   10 FORMAT(/' A TRIANGULAR SLIT FUNCTION OF',F6.3,' CM-1 HALFWIDTH IS */
/* TKS     ' USED'/) */
L106:
    return 0;
} /* profile_ */

#undef slit
#undef dx
#undef wnrmax3
#undef nsri
#undef ns
#undef nsriup
#undef rsi


/* X    FUNCTION SPECFCT(FREQ,OMEGA,PHI,PHI2,N,RTEMP) */

double specfct_(double *freq, double *omega, double *phi,
  double *phi2, int *n, double *rtemp)
{
    /* System generated locals */
    double ret_val;

    /* Local variables */
    double tfac, f, gp, si;
    int nr;
    extern /* Subroutine */ int ixpolat_(int *, int *, int *,
      double *, double *, double *, double *,
      double *, double *, int *, double *);


/*     THIS INTERPOLATES THE SPECTRAL FUNCTION PHI(FREQ) DEFINED AT */
/*     OMEGA(N) AS PHI(N). PHI2 IS THE SECOND DERIVATIVE AT OMEGA */
/*     WHICH MUST BE OBTAINED FIRST (USE SPLINE FOR THAT PURPOSE). */
/*     RTEMP IS THE RECIPROCAL TEMPERATURE IN CM-1 UNITS. */
/*     NOTE THAT WE INTERPOLATE 1.E80 TIMES THE LOGARITHM OF PHI(OMEGA) */
/*     NOTE THAT IN GSO'S REVISION, THIS FACTOR IS REMOVED. */
/*     (REVISION MODIFIED) */



/*      PRINT*,'FREQ =',FREQ */
/*      PRINT*,'OMEGA=',OMEGA */
/*      PRINT*,'RTEMP=',RTEMP */
/*      PRINT*,'PHI  =',PHI */
/*      PRINT*,'PHI2 =',PHI2 */
    /* Parameter adjustments */
    --phi2;
    --phi;
    --omega;

    /* Function Body */
    tfac = 0.;
    f = *freq;
    if (f >= 0.) {
  goto L20;
    } else {
  goto L10;
    }
L10:
    f = abs(f);
    tfac = -(*rtemp) * f;
L20:
    if (f <= omega[*n]) {
  goto L30;
    }
    ret_val = exp(-(phi[*n - 1] - phi[*n]) * (f - omega[*n]) / (omega[*n] -
      omega[*n - 1]) + phi[*n] + tfac) * 1e-80;
/*      print*,' (A) SPECFCT=',SPECFCT */
/* X    SPECFCT=DEXP(-(PHI(N-1)-PHI(N))*(F-OMEGA(N))/ */
/* X   $(OMEGA(N)-OMEGA(N-1))+PHI(N)+TFAC) */
    return ret_val;
/* 30   PRINT*,'SI,NR,PHI2=', */
/*     &        SI,NR,PHI2 */
/*      CALL IXPOLAT(N,1,0,1.D-6,OMEGA,PHI,F,GP,SI,NR,PHI2) */
L30:
    ixpolat_(n, &cs__1, &cs__0, &c_b183, &omega[1], &phi[1], &f, &gp, &si, &
      nr, &phi2[1]);
    ret_val = exp(tfac + gp) * 1e-80;
/* X    SPECFCT=DEXP(TFAC+GP) */
/*      print*,' (B) GP,SPECFCT=',GP,SPECFCT */

    return ret_val;
} /* specfct_ */
#define slit (app3a_1.slit)
#define dx (app3a_1.dx)
#define wnrmax3 (app3a_1.wnrmax3)
#define nsri (app3b_1.nsri)
#define ns (app3b_1.ns)
#define nsriup (app3b_1.nsriup)
#define eb (energ_1.eb)
#define niv (energ_1.niv)
#define nlines (dimer_1.nlines)
#define rsibb (bl3_2.rsibb)
#define ldelvi (bbbb_2.ldelvi)
#define ivi (bbbb_2.ivi)
#define ivip (bbbb_2.ivip)
#define ldelel (bbbb_2.ldelel)
#define ll (bbbb_2.ll)
#define llp (bbbb_2.llp)

/* Subroutine */ int bound32_(double *temp, double *rsi, int *
  nsol)
{
    /* Initialized data */

    static int ldelvis[63] = { 0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,3,
      3,4,4,4,4,4,4,4,4 };
    static int ivis[63] = { 0,0,1,1,2,2,3,3,4,4,0,0,0,0,1,1,1,1,2,2,2,2,
      3,3,3,3,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,0,1,2,0,1,2,0,1,0,1,0,1,2,
      0,1,0,1,0,1,0,1 };
    static int ivips[63] = { 0,0,1,1,2,2,3,3,4,4,1,1,1,1,2,2,2,2,3,3,3,3,
      4,4,4,4,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,3,4,5,3,4,5,3,4,3,4,3,4,5,
      4,5,4,5,4,5,4,5 };
    static int ldelels[63] = { 1,3,1,3,1,3,1,3,1,3,-3,-1,1,3,-3,-1,1,3,
      -3,-1,1,3,3,1,-1,-3,-3,-1,1,3,-3,-1,1,3,-3,-1,1,3,-1,-3,1,3,1,1,1,
      -1,-1,-1,-3,-3,3,3,-3,-3,-3,-3,-3,3,3,1,1,-1,-1 };
    static double as[63] = { 4.4844e-40,4.4356e-40,2.9345e-40,2.885e-40,
      1.6441e-40,1.5899e-40,7.2882e-41,6.7748e-41,1.0378e-41,1.3041e-42,
      1.5006e-41,1.537e-41,1.6139e-41,1.7143e-41,1.9985e-41,2.0169e-41,
      2.0994e-41,2.2094e-41,1.636e-41,1.6281e-41,1.6714e-41,1.7326e-41,
      8.0425e-42,8.0862e-42,8.0093e-42,8.1366e-42,2.4471e-42,2.5406e-42,
      2.6629e-42,2.8064e-42,4.6227e-42,4.715e-42,4.8513e-42,5.0133e-42,
      3.9968e-42,3.984e-42,3.981e-42,3.9687e-42,1.1806e-42,1.3458e-42,
      3.8746e-42,3.9219e-42,7.3334e-43,1.339e-42,1.3041e-42,7.1401e-43,
      1.3461e-42,6.5776e-43,6.9847e-43,1.3517e-42,7.5545e-43,1.3268e-42,
      6.9847e-43,1.3517e-42,7.464e-43,2.1322e-43,2.6037e-43,2.0823e-43,
      2.0632e-43,2.1067e-43,2.0531e-43,2.1218e-43,2.3006e-43 };
    static double bs[63] = { 4.3e-4,4.6e-4,8.3e-4,8.9e-4,.0017,.00186,
      .0041,.00457,0.,0.,9.99e-4,5.23e-4,1.49e-4,-1.68e-4,.001837,
      .001153,6.6e-4,2.54e-4,.003603,.002677,.002101,.001738,.00595,
      .006843,0.,.007035,.001025,6.42e-4,2.54e-4,-1.64e-4,.002342,
      .001975,.00164,.001328,.004943,.004999,.005461,.006839,0.,.010993,
      0.,0.,.001367,.005262,0.,.001601,.00451,0.,.001828,.004175,.04816,
      .007033,.001828,.004175,.009338,.003733,.008508,.006979,0.,
      .005035,0.,.004169,0. };
    static double twopic = 1.88365183e11;
    static double pi = 3.141592654;

    /* System generated locals */
    int s__1;
    double d__1;

    /* Local variables */
    double alfa;
    int nnii, nsol2;
    double a, b;
    int i__, l, n;
    double stoke, stoki, am, pf;
    int lp;
    double rm;
    int nr, iv;
    double stokip;
    int ivp;
    extern double clebsqr_(int *, int *, int *);
    extern /* Subroutine */ int profile_(double *, double *);


#define eb_ref(a_1,a_2) eb[(a_2)*41 + a_1 - 42]



/*     COMMON/APP3/SLIT,DX,NSRI,WNRMAX3,NS,NSRIUP */


/*          STORED VALUES */
    /* Parameter adjustments */
    --rsi;

    /* Function Body */


/*     EB(I,K) - BOUND ENERGIES */
/*     AM =  (MTX.EL. (L,BETA,L') )**2 */
/*     M(L,L',V,V') OF PAPER (*) ARE TO BE CORRECTED: */
/*     M(L,L',V,V') = AM * (2L+1) * C(L,3,L')**2 */
/*     NSRI - HOW MANY POINTS FOR B-B SPECTRAL FUNCTION TO BE GIVEN */
/*     WNRMAX3 - THE FREQUENCY RANGE OF B-B CONTRIBUTION */
/*     SLIT- THE HALFWIDTH OF THE SPECTRAL PROFILE CONVOLUTED WITH */
/*     B-B SPECTRUM, IN [CM-1]. */
/*       A,B, COEFFICIENTS , EQ. 7, A.BORYSOW, L.FROMMHOLD, */
/*       AP. J. VOL.311, 1043-1057, (1986) */

    nsri = 190;
    wnrmax3 = 45.;
    nsriup = (nsri << 1) + 1;
    dx = wnrmax3 / (double) nsri;
    ns = (int) (slit / dx);

    for (i__ = 1; i__ <= 401; ++i__) {
/* L300: */
  rsibb[i__ - 1] = 0.;
    }

    alfa = 1. / (*temp * .69519);
    rm = 2.32498211e-23;
/*     RM - REDUCED MASS FOR N2-N2 */

    d__1 = rm * 1.380662e-16 * *temp * 2. * pi / 4.3906208382975998e-53;
    pf = pow(d__1, c_b186);
/*       SCALE DOWN BY 1.D60 */
    pf *= 1e-60;

    nr = 0;
L555:
    ++nr;
    ldelvi = ldelvis[nr - 1];
    ivi = ivis[nr - 1];
    ivip = ivips[nr - 1];
    ldelel = ldelels[nr - 1];
    a = as[nr - 1];
    b = bs[nr - 1];
/*     WRITE (6,334) LDELVI,IVI,IVIP, LDELEL,A,B */
/* L334: */

/*       LDELVI=DELTA(V)=V'-V */
/*       IVI = V; IVIP = V' */
/*       LDELEL = DELTA(L) = L'-L */

    iv = ivi + 1;
    ivp = ivip + 1;
/*       THESE ARE ENERGY COLUMNS (V, V') */

    nnii = niv[iv - 1];

    s__1 = nnii;
    for (l = 1; l <= s__1; ++l) {
/*       LOOP OVER INITIAL L-VALUES... */

  am = a * exp(-b * (double) ((l - 1) * l));
/*       L - NUMBER OF ROW, (L-1) - ROTATIONAL LEVEL */
  lp = l + ldelel;
  ll = l - 1;
  llp = lp - 1;
/*       LL,LLP ARE INITIAL L AND FINAL L' ANGULAR MOMENTUM QUANTUM NUMBERS */

  if (lp > niv[ivp - 1] || lp < 1) {
      goto L20;
  }
  if (eb_ref(lp, ivp) == 0.) {
      goto L20;
  }
  if (eb_ref(l, iv) == 0.) {
      goto L20;
  }
  stoke = eb_ref(lp, ivp) - eb_ref(l, iv);

  stoki = am * exp(-alfa * eb_ref(l, iv)) / pf * (double) ((ll << 1)
     + 1) * clebsqr_(&ll, &cs__3, &llp);

  profile_(&stoke, &stoki);
  if (stoki > 0.) {
      ++nlines;
  }

  stokip = am * exp(-alfa * eb_ref(lp, ivp)) / pf * (double) ((llp
    << 1) + 1) * clebsqr_(&llp, &cs__3, &ll);

  d__1 = -stoke;
  profile_(&d__1, &stokip);
  if (stokip > 0.) {
      ++nlines;
  }

L20:
  ;
    }
    if (nr == 63) {
  goto L56;
    }
    goto L555;
L56:

/*     32 ENTRIES FOR (3220)+(3202) IN TABLE 6, 63 IN ALL: */
/*     DATA EXPANDED AND INCLUDE NOW ALL POSSIBLE B-B TRANSITIONS */

    s__1 = nsriup;
    for (n = 1; n <= s__1; ++n) {
/* L90: */
  rsibb[n - 1] = rsibb[n - 1] / twopic / slit;
    }

    *nsol = nsri + 1;
    nsol2 = *nsol + 1;
/*     RSI - CONTRIBUTION FOR POSITIVE FREQUENCY SHIFTS */

    s__1 = *nsol;
    for (i__ = 1; i__ <= s__1; ++i__) {
/* L22: */
  rsi[i__] = rsibb[*nsol - 1 + i__ - 1];
    }

/*        PRINT 999, (RSI(I),I=1,NSOL) */
/* L999: */

    return 0;
} /* bound32_ */

#undef slit
#undef dx
#undef wnrmax3
#undef nsri
#undef ns
#undef nsriup
#undef eb
#undef niv
#undef nlines
#undef rsibb
#undef ldelvi
#undef ivi
#undef ivip
#undef ldelel
#undef ll
#undef llp


#undef eb_ref

#define slit (app3a_1.slit)
#define dx (app3a_1.dx)
#define wnrmax3 (app3a_1.wnrmax3)
#define nsri (app3b_1.nsri)
#define ns (app3b_1.ns)
#define nsriup (app3b_1.nsriup)
#define eb (energ_1.eb)
#define niv (energ_1.niv)
#define nlines (dimer_1.nlines)
#define rsibb (bl3_2.rsibb)

/* Subroutine */ int bound54_(double *temp, double *rsi, int *
  nsol)
{
    /* Initialized data */

    static int ldelvis[54] = { 0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1,1,
      1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2
      };
    static int ivis[54] = { 0,0,0,1,1,1,2,2,2,3,3,3,0,0,0,0,0,0,1,1,1,1,
      1,1,2,2,2,2,2,2,3,3,3,3,3,3,0,0,0,0,0,0,1,1,1,1,1,1,2,2,2,2,2,2 };
    static int ivips[54] = { 0,0,0,1,1,1,2,2,2,3,3,3,1,1,1,1,1,1,2,2,2,2,
      2,2,3,3,3,3,3,3,4,4,4,4,4,4,2,2,2,2,2,2,3,3,3,3,3,3,4,4,4,4,4,4 };
    static int ldelels[54] = { 1,3,5,1,3,5,1,3,5,1,3,5,-5,-3,-1,1,3,5,-5,
      -3,-1,1,3,5,-5,-3,-1,1,3,5,-5,-3,-1,1,3,5,-5,-3,-1,1,3,5,-5,-3,-1,
      1,3,5,-5,-3,-1,1,3,5 };
    static double as[54] = { 7.9332e-42,7.8207e-42,7.7235e-42,4.5815e-42,
      4.4834e-42,4.4059e-42,2.173e-42,2.0824e-42,2.025e-42,7.7222e-43,
      7.0351e-43,6.6815e-43,4.9611e-43,5.2232e-43,5.2979e-43,5.4652e-43,
      5.6827e-43,5.9277e-43,5.733e-43,6.062e-43,6.0862e-43,6.2104e-43,
      6.3809e-43,6.5698e-43,3.9501e-43,4.1599e-43,4.1033e-43,4.1097e-43,
      4.1339e-43,4.153e-43,1.5858e-43,1.5976e-43,1.5478e-43,1.5066e-43,
      1.4554e-43,1.3848e-43,9.9241e-44,1.0109e-43,1.0396e-43,1.0758e-43,
      1.1176e-43,1.1636e-43,1.646e-43,1.647e-43,1.6617e-43,1.6837e-43,
      1.7085e-43,1.7327e-43,1.1797e-43,1.1593e-43,1.1405e-43,1.1174e-43,
      1.0853e-43,1.0401e-43 };
    static double bs[54] = { 6.12e-4,6.35e-4,6.77e-4,.001137,.001201,
      .001341,.00229,.002449,.00287,.005426,.005876,.00745,.001,8.83e-4,
      6.09e-4,3.92e-4,2.07e-4,3.7e-5,.001625,.001624,.001305,.001084,
      9.27e-4,8.21e-4,.002978,.003273,.002994,.002954,.003153,.003668,
      .005799,.006423,.006733,.00796,.010937,.019179,.001229,9.93e-4,
      7.67e-4,5.43e-4,3.09e-4,5.1e-5,.002456,.0023,.00221,.002193,
      .002273,.002506,.004556,.004825,.005454,.006725,.009431,.016672 };
    static double twopic = 1.88365183e11;
    static double pi = 3.141592654;

    /* System generated locals */
    int s__1;
    double d__1;

    /* Local variables */
    double alfa;
    int nnii, ivip, nsol2;
    double a, b;
    int i__, l, n;
    double stoke, stoki, am, pf;
    int ll, lp;
    double rm;
    int nr, ldelel, iv, ldelvi;
    double stokip;
    int ivi, llp, ivp;
    extern double clebsqr_(int *, int *, int *);
    extern /* Subroutine */ int profile_(double *, double *);


#define eb_ref(a_1,a_2) eb[(a_2)*41 + a_1 - 42]



/*     COMMON/APP3/SLIT,DX,NSRI,WNRMAX3,NS,NSRIUP */
/*          STORED VALUES */

/* TKS     THIS DATA STRUCTURE HAS 55 ENTRIES AND NOT 54!! */
/* TKS      DATA LDELVIS /0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,1, */
/* TKS     &              1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,2,2, */
/* TKS     &              2,2,2,2,2,2,2,2,2,2,2,2,2,2,2/ */
/* TKS  WE HAVE SSKIPPED THE LAST "2" IN THIS DATA STATEMENT */
    /* Parameter adjustments */
    --rsi;

    /* Function Body */








    nsri = 190;
    wnrmax3 = 47.;
    nsriup = (nsri << 1) + 1;
    dx = wnrmax3 / (double) nsri;
    ns = (int) (slit / dx);

    for (i__ = 1; i__ <= 401; ++i__) {
/* L300: */
  rsibb[i__ - 1] = 0.;
    }
    alfa = 1. / (*temp * .69519);
    rm = 2.32498211e-23;
/*     RM - REDUCED MASS FOR N2-N2 */

    d__1 = rm * 1.380662e-16 * *temp * 2. * pi / 4.3906208382975998e-53;
    pf = pow(d__1, c_b186);
/*       SCALE DOWNWARD BY 1.D60 */
    pf *= 1e-60;

    nr = 0;
L555:
    ++nr;
    ldelvi = ldelvis[nr - 1];
    ivi = ivis[nr - 1];
    ivip = ivips[nr - 1];
    ldelel = ldelels[nr - 1];
    a = as[nr - 1];
    b = bs[nr - 1];
/*       WRITE (6,334) LDELVI,IVI,IVIP, LDELEL,A,B */
/* L334: */
/*       LDELVI=DELTA(V)=V'-V */
/*       IVI = V */
/*       LDELEL = DELTA(L) = L'-L */

    iv = ivi + 1;
    ivp = ivip + 1;
    nnii = niv[iv - 1];
    s__1 = nnii;
    for (l = 1; l <= s__1; ++l) {
  am = a * exp(-b * (double) (l * (l + 1)));
  lp = l + ldelel;
  ll = l - 1;
  llp = lp - 1;
  if (lp > niv[ivp - 1] || lp < 1) {
      goto L20;
  }
  if (eb_ref(lp, ivp) == 0.) {
      goto L20;
  }
  if (eb_ref(l, iv) == 0.) {
      goto L20;
  }

  stoke = eb_ref(lp, ivp) - eb_ref(l, iv);
  stoki = am * exp(-alfa * eb_ref(l, iv)) / pf * (double) ((ll << 1)
     + 1) * clebsqr_(&ll, &cs__5, &llp);
  profile_(&stoke, &stoki);
  if (stoki > 0.) {
      ++nlines;
  }
  stokip = am * exp(-alfa * eb_ref(lp, ivp)) / pf * (double) ((llp
    << 1) + 1) * clebsqr_(&llp, &cs__5, &ll);
  d__1 = -stoke;
  profile_(&d__1, &stokip);
  if (stokip > 0.) {
      ++nlines;
  }
L20:
  ;
    }
    if (nr == 54) {
  goto L56;
    }

    goto L555;
L56:
/*       54 ENTRIES FOR (5440)=(5404) IN TABLE 6 */

    s__1 = nsriup;
    for (n = 1; n <= s__1; ++n) {
/* L90: */
  rsibb[n - 1] = rsibb[n - 1] / twopic / slit;
    }

    *nsol = nsri + 1;
    nsol2 = *nsol + 1;

    s__1 = *nsol;
    for (i__ = 1; i__ <= s__1; ++i__) {
/* L22: */
  rsi[i__] = rsibb[*nsol - 1 + i__ - 1];
    }

/*     PRINT 999, (RSI(I),I=1,NSOL) */
/* L999: */

    return 0;
} /* bound54_ */

#undef slit
#undef dx
#undef wnrmax3
#undef nsri
#undef ns
#undef nsriup
#undef eb
#undef niv
#undef nlines
#undef rsibb


#undef eb_ref


double clebsqr_0_(int n__, int *l, int *lambda, int *lp)
{
    /* System generated locals */
    int s__1, s__2;
    double ret_val, d__1;

    /* Local variables */
    extern double fctl_(int *);
    double f;
    int i__;
    double p;
    int i0, i1;
    double fc;

/*     SQUARE OF CLEBSCH-GORDAN COEFFICIENT (L,LAMBDA,0,0;LP,0) */
/*     FOR INTEGER ARGUMENTS ONLY */
/*     NOTE THAT LAMBDA SHOULD BE SMALL, MAYBE @10 OR SO. */


    switch(n__) {
  case 1: goto L_threej2;
  }

    fc = (double) ((*lp << 1) + 1);
    goto L2;


L_threej2:
/*     THIS ENTRY RETURNS THE SQUARED 3-J SYMBOL   L LAMBDA LP */
/*                                                 0    0    0 */
/*     INSTEAD OF THE CLEBSCH-GORDAN COEFFICIENT */
/*     (LIMITATION TO INTEGER ARGUMENTS ONLY) */

/*     NOTE THAT THE THREE-J SYMBOLS ARE COMPLETELY SYMMETRIC IN THE */
/*     ARGUMENTS. IT WOULD BE ADVANTAGEOUS TO REORDER THE INPUT ARGUMENT */
/*     LIST SO THAT LAMBDA BECOMES THE SMALLEST OF THE 3 ARGUMENTS. */
    fc = 1.;
L2:
    ret_val = 0.;
    if (*l + *lambda < *lp || *lambda + *lp < *l || *l + *lp < *lambda) {
  return ret_val;
    }
    if ((*l + *lp + *lambda) % 2 != 0) {
  return ret_val;
    }
    if (*l < 0 || *lp < 0 || *lambda < 0) {
  return ret_val;
    }
    f = 1. / (double) (*l + *lp + 1 - *lambda);
    if (*lambda == 0) {
  goto L22;
    }
    i1 = (*l + *lp + *lambda) / 2;
    i0 = (*l + *lp - *lambda) / 2 + 1;
    s__1 = i1;
    for (i__ = i0; i__ <= s__1; ++i__) {
/* L20: */
  f = f * (double) i__ / (double) (((i__ << 1) + 1) << 1);
    }
L22:
    s__1 = *lambda + *l - *lp;
    s__2 = *lambda + *lp - *l;
    p = fc * f * fctl_(&s__1) * fctl_(&s__2);
    s__1 = (*lambda + *l - *lp) / 2;
    s__2 = (*lambda + *lp - *l) / 2;
/* Computing 2nd power */
    d__1 = fctl_(&s__1) * fctl_(&s__2);
    ret_val = p / (d__1 * d__1);
    return ret_val;
} /* clebsqr_ */

double clebsqr_(int *l, int *lambda, int *lp)
{
    return clebsqr_0_(0, l, lambda, lp);
    }

double threej2_(void)
{
    return clebsqr_0_(1, (int *)0, (int *)0, (int *)0);
    }

double fctl_(int *n)
{
    /* System generated locals */
    int s__1;
    double ret_val, d__1;

    /* Local variables */
    int i__, j;
    double z__;



    ret_val = 1.;
    if (*n <= 1) {
  return ret_val;
    }
    if (*n > 15) {
  goto L20;
    }
    j = 1;
    s__1 = *n;
    for (i__ = 2; i__ <= s__1; ++i__) {
/* L10: */
  j *= i__;
    }
    ret_val = (double) j;
    return ret_val;
L20:
    z__ = (double) (*n + 1);
    d__1 = z__ - .5;
    ret_val = exp(-z__) * pow(z__, d__1) * ((((-2.294720936e-4 / z__ -
      .00268132716) / z__ + .003472222222) / z__ + .08333333333) / z__
      + 1.) * 2.506628274631;
    return ret_val;
} /* fctl_ */
#define ik1k0 (k1k0_1.ik1k0)

double bgama_(double *fnu, double *t1, double *t2, double
  *eps, double *t3, double *t4, double *temp)
{
    /* Initialized data */

    static double pi = 3.1415926535898;
    static double clight = 29979245800.;
    static double hbar = 1.0545887e-27;
    static double boltz = 1.380662e-16;

    /* System generated locals */
    double ret_val, d__1, d__2, d__3, d__4;

    /* Local variables */
    double omega, z__, k0, t0, bgambc, zp, xk1;

/*     SPECTRAL FUNCTION "EBC", FOR REFERENCE: */
/*     SEE "PHENOMENA INDUCED BY INTERMOLECULAR INTERACTIONS", */
/*     ED. G. BIRNBAUM; J. BORYSOW AND L. FROMMHOLD, P.67, (1985) */
/*       ============================================ */


/*       IF IK1K0=1 ONLY B-C; EBC OTHERWISE */

    omega = 2. * pi * clight * *fnu;
    t0 = hbar / (boltz * 2. * *temp);
/* Computing 2nd power */
    d__1 = omega * *t1;
    z__ = sqrt((d__1 * d__1 + 1.) * (*t2 * *t2 + t0 * t0)) / *t1;
    if (z__ - 2. <= 0.) {
  goto L10;
    } else {
  goto L12;
    }
L10:
/* Computing 2nd power */
    d__2 = z__ / 3.75;
    d__1 = d__2 * d__2;
/* Computing 2nd power */
    d__4 = z__ / 2.;
    d__3 = d__4 * d__4;
    xk1 = z__ * z__ * log(z__ / 2.) * ((((((3.2411e-4 * d__1 + .00301532) *
      d__1 + .02658733) * d__1 + .15084934) * d__1 + .51498869) * d__1
      + .87890594) * d__1 + .5) + ((((((-4.686e-5 * d__3 - .00110404) *
      d__3 - .01919402) * d__3 - .18156897) * d__3 - .67278579) * d__3
      + .15443144) * d__3 + 1.);
    goto L20;
L12:
    d__1 = 2. / z__;
    xk1 = sqrt(z__) * exp(-z__) * ((((((-6.8245e-4 * d__1 + .00325614) * d__1
      - .00780353) * d__1 + .01504268) * d__1 - .0365562) * d__1 +
      .23498619) * d__1 + 1.25331414);
L20:
/* Computing 2nd power */
    d__1 = *t1 * omega;
    bgambc = *t1 / pi * exp(*t2 / *t1 + t0 * omega) * xk1 / (d__1 * d__1 + 1.)
      ;
    if (ik1k0 == 1) {
  goto L55;
    }
/* Computing 2nd power */
    d__1 = omega * *t4;
    zp = sqrt((d__1 * d__1 + 1.) * (*t3 * *t3 + t0 * t0)) / *t4;
    if (zp - 2. <= 0.) {
  goto L22;
    } else {
  goto L24;
    }
L22:
/* Computing 2nd power */
    d__2 = zp / 3.75;
    d__1 = d__2 * d__2;
/* Computing 2nd power */
    d__4 = zp / 2.;
    d__3 = d__4 * d__4;
    k0 = -log(zp / 2.) * ((((((.0045813 * d__1 + .0360768) * d__1 + .2659732)
      * d__1 + 1.2067492) * d__1 + 3.0899424) * d__1 + 3.5156229) *
      d__1 + 1.) + ((((((7.4e-6 * d__3 + 1.075e-4) * d__3 + .00262698) *
       d__3 + .0348859) * d__3 + .23069756) * d__3 + .4227842) * d__3 -
      .57721566);
    goto L30;
L24:
    d__1 = 2. / zp;
    k0 = exp(-zp) * ((((((5.3208e-4 * d__1 - .0025154) * d__1 + .00587872) *
      d__1 - .01062446) * d__1 + .02189568) * d__1 - .07832358) * d__1
      + 1.25331414) / sqrt(zp);
L30:
    ret_val = (bgambc + *eps * (*t3 / pi) * exp(*t3 / *t4 + t0 * omega) * k0)
      / (*eps + 1.);
    goto L66;
L55:
    ret_val = bgambc;
L66:
    return ret_val;
} /* bgama_ */

#undef ik1k0


/* Subroutine */ int spline_0_(int n__, int *l, int *m, int *k,
   double *eps, double *x, double *y, double *t,
  double *ss, double *si, int *nr, double *s2)
{
    /* System generated locals */
    int s__1, s__2;
    double d__1, d__2;

    /* Local variables */
    double epsi, prod, h__;
    int i__, j, n;
    double w, omega;
    int n1;
    double s3;
    int ic;
    double sm, delsqs, ht1, ht2, ss2, yp1, eta, ypn;



/*     SPLINE INTERPOLATION AND QUADRATURE, THIRD ORDER AFTER GREVILLE. */
/*     INPUT ARGUMENTS L...Y, OUTPUT SS...NR. */
/*     L DATA POINTS X(1), Y(1) ... X(L),Y(L) */
/*     EPS=ERROR CRITERION, TYPICALLY EPS=1.D-5 FOR 5 DECI. PLACES ACCURA */
/*     M ARGUMENTS T(1)..T(M) FOR WHICH FUNCTION VALUES SS(1)..SS(M), FOR */
/*     K=0; OR FIRST OR SECOND DERIVATIVE FOR K=1 OR -1, RESPECTIVELY. */
/*     NOTE THAT M HAS TO BE AT LEAST EQUAL TO 1. */
/*     SI=INTEGRAL (OVER WHOLE INTERVAL) FOR K=2 ONLY. */
/*     FOR 'NATURAL' SPLINE FUNCTIONS, S2(1)=S2(L)=0. MUST BE INPUT*NOTE* */
/*     N0 INDICATES THE NUMBER OF OUT-OF-RANGE CALLS. X(1)<T(I)<X(L) */
/*     EXTRAPOLATE WITH CAUTION. (ASSUMPTION D2Y/DX2 = 0.) */
/*     S2(I) IS THE 2ND DERIVATIVE AT X=X(I) AND IS COMPUTED INTERNALLY. */
/*     DIMENSION X(L),Y(L),T(M),SS(M),S2(L) */

    /* Parameter adjustments */
    --x;
    --y;
    --t;
    --ss;
    --s2;

    /* Function Body */
    switch(n__) {
  case 1: goto L_ixpolat;
  }

    n = *l;
    n1 = n - 1;
    *nr = 0;
/* L4: */
    s__1 = n1;
    for (i__ = 2; i__ <= s__1; ++i__) {
/* L52: */
  s__2 = i__ - 1;
  s2[i__] = 3. * ((y[i__ + 1] - y[i__]) / (x[i__ + 1] - x[i__]) - (y[
    s__2 + 1] - y[s__2]) / (x[s__2 + 1] - x[s__2])) / (x[i__ + 1]
    - x[i__ - 1]) / 1.5;
    }
    omega = 1.0717968;
    ic = 0;
/*     'NATURAL' SPLINE FUNCTIONS OF THIRD ORDER. */
    s2[1] = 0.;
    s2[n] = 0.;
L5:
    eta = 0.;
    ++ic;
    sm = abs(s2[1]);
    s__2 = n;
    for (i__ = 2; i__ <= s__2; ++i__) {
  if ((d__1 = s2[i__], abs(d__1)) > sm) {
      sm = (d__2 = s2[i__], abs(d__2));
  }
/* L25: */
    }
    epsi = *eps * sm;
/* L6: */
    s__2 = n1;
    for (i__ = 2; i__ <= s__2; ++i__) {
/* L7: */
  s__1 = i__ - 1;
  w = (3. * ((y[i__ + 1] - y[i__]) / (x[i__ + 1] - x[i__]) - (y[s__1 +
    1] - y[s__1]) / (x[s__1 + 1] - x[s__1])) / (x[i__ + 1] - x[
    i__ - 1]) - (x[i__] - x[i__ - 1]) * .5 / (x[i__ + 1] - x[i__
    - 1]) * s2[i__ - 1] - (.5 - (x[i__] - x[i__ - 1]) * .5 / (x[
    i__ + 1] - x[i__ - 1])) * s2[i__ + 1] - s2[i__]) * omega;
/* L8: */
  if (abs(w) - eta <= 0.) {
      goto L10;
  } else {
      goto L9;
  }
L9:
  eta = abs(w);
L10:
  s2[i__] += w;
    }
/* L13: */
    if (eta - epsi >= 0.) {
  goto L5;
    } else {
  goto L14;
    }
/*     ENTRY IXPOLAT */

L_ixpolat:
/*     THIS ENTRY USEFUL WHEN ITERATION PREVIOUSLY COMPLETED */

    n = *l;
    n1 = n - 1;
    *nr = 0;
    ic = -1;
L14:
    if (*k - 2 != 0) {
  goto L15;
    } else {
  goto L20;
    }
L15:
    s__2 = *m;
    for (j = 1; j <= s__2; ++j) {
/* L16: */
  i__ = 1;
/* L54: */
  if ((d__1 = t[j] - x[1]) < 0.) {
      goto L58;
  } else if (d__1 == 0) {
      goto L17;
  } else {
      goto L55;
  }
L55:
  if ((d__1 = t[j] - x[n]) < 0.) {
      goto L57;
  } else if (d__1 == 0) {
      goto L59;
  } else {
      goto L158;
  }
L56:
  if ((d__1 = t[j] - x[i__]) < 0.) {
      goto L60;
  } else if (d__1 == 0) {
      goto L17;
  } else {
      goto L57;
  }
L57:
  ++i__;
  goto L56;

L58:
  ++(*nr);
  ht1 = t[j] - x[1];
  ht2 = t[j] - x[2];
  yp1 = (y[cs__1 + 1] - y[cs__1]) / (x[cs__1 + 1] - x[cs__1]) + (x[1] -
    x[2]) * (s2[1] * 2. + s2[2]) / 6.;
  if (*k < 0) {
      goto L72;
  } else if (*k == 0) {
      goto L70;
  } else {
      goto L71;
  }
L71:
  ss[j] = yp1 + ht1 * s2[1];
  goto L61;
L70:
  ss[j] = y[1] + yp1 * ht1 + s2[1] * ht1 * ht1 / 2.;
  goto L61;
L72:
  ss[j] = s2[i__];
  goto L61;
L158:
  ht2 = t[j] - x[n];
  ht1 = t[j] - x[n1];
  ++(*nr);
  ypn = (y[n1 + 1] - y[n1]) / (x[n1 + 1] - x[n1]) + (x[n] - x[n1]) * (
    s2[n1] + s2[n] * 2.) / 6.;
  if (*k < 0) {
      goto L82;
  } else if (*k == 0) {
      goto L80;
  } else {
      goto L81;
  }
L81:
  ss[j] = ypn + ht2 * s2[n];
  goto L61;
L80:
  ss[j] = y[n] + ypn * ht2 + s2[n] * ht2 * ht2 / 2.;
  goto L61;
L82:
  ss[j] = s2[n];
  goto L61;

L59:
  i__ = n;
L60:
  --i__;
L17:
  ht1 = t[j] - x[i__];
  ht2 = t[j] - x[i__ + 1];
  prod = ht1 * ht2;
  s3 = (s2[i__ + 1] - s2[i__]) / (x[i__ + 1] - x[i__]);
  ss2 = s2[i__] + ht1 * s3;
  delsqs = (s2[i__] + s2[i__ + 1] + ss2) / 6.;

  if (*k < 0) {
      goto L43;
  } else if (*k == 0) {
      goto L41;
  } else {
      goto L42;
  }
L41:
  ss[j] = y[i__] + ht1 * ((y[i__ + 1] - y[i__]) / (x[i__ + 1] - x[i__]))
     + prod * delsqs;
  goto L61;
L42:
  ss[j] = (y[i__ + 1] - y[i__]) / (x[i__ + 1] - x[i__]) + (ht1 + ht2) *
    delsqs + prod * s3 / 6.;
  goto L61;
L43:
  ss[j] = ss2;
L61:
  ;
    }
L20:
    *si = 0.;

    s__2 = n1;
    for (i__ = 1; i__ <= s__2; ++i__) {
  h__ = x[i__ + 1] - x[i__];
/* L62: */
/* Computing 3rd power */
  d__1 = h__;
  *si = *si + h__ * .5 * (y[i__] + y[i__ + 1]) - d__1 * (d__1 * d__1) *
    (s2[i__] + s2[i__ + 1]) / 24.;
    }

    if (*k == 2) {
  *nr = ic;
    }

    return 0;
} /* spline_ */

/* Subroutine */ int spline_(int *l, int *m, int *k,
  double *eps, double *x, double *y, double *t,
  double *ss, double *si, int *nr, double *s2)
{
    return spline_0_(0, l, m, k, eps, x, y, t, ss, si, nr, s2);
    }

/* Subroutine */ int ixpolat_(int *l, int *m, int *k,
  double *eps, double *x, double *y, double *t,
  double *ss, double *si, int *nr, double *s2)
{
    return spline_0_(1, l, m, k, eps, x, y, t, ss, si, nr, s2);
    }


// ---------------------- end of Borysow N2N2 F77 code -------------------------


// ---------------------- begin of monortm CKD F77 code -------------------------


/* Common Block Declarations */

struct fh2oa_1_ {
    double fh2o[2003];
};

#define fh2oa_1 (*(struct fh2oa_1_ *) &fh2oa_)

struct fh2ob_1_ {
    double v1, v2, dv;
    int nptfh2o;
};
struct fh2ob_2_ {
    double v1, v2, dv;
    int npts;
};

#define fh2ob_1 (*(struct fh2ob_1_ *) &fh2ob_)
#define fh2ob_2 (*(struct fh2ob_2_ *) &fh2ob_)

struct sh2oa_1_ {
    double swv296[2003];
};

#define sh2oa_1 (*(struct sh2oa_1_ *) &sh2oa_)

struct sh2ob_1_ {
    double v1, v2, dv;
    int nptslfwv;
};
struct sh2ob_2_ {
    double v1, v2, dv;
    int npts;
};

#define sh2ob_1 (*(struct sh2ob_1_ *) &sh2ob_)
#define sh2ob_2 (*(struct sh2ob_2_ *) &sh2ob_)

struct s260a_1_ {
    double swv260[2003];
};

#define s260a_1 (*(struct s260a_1_ *) &s260a_)

struct s260b_1_ {
    double v1___, v2___, dv___;
    int nptslfwv___;
};
struct s260b_2_ {
    double v1, v2, dv;
    int npts;
};

#define s260b_1 (*(struct s260b_1_ *) &s260b_)
#define s260b_2 (*(struct s260b_2_ *) &s260b_)

struct consts_1_ {
    double pi, planck, boltz, clight, avogad, alosmt, gascon, radcn1,
      radcn2;
};

#define consts_1 (*(struct consts_1_ *) &consts_)

/* Initialized data */

struct s_fh2oa_ {
    double e_1[2003];
    } fh2oa_ = { {.012859, .011715, .011038, .011715, .012859, .015326,
      .016999, .018321, .019402, .01957, .019432, .017572, .01676,
      .01548, .013984, .012266, .010467, .0094526, .0080485, .0069484,
      .0061416, .0050941, .0044836, .0038133, .0034608, .0031487,
      .0024555, .0020977, .0017266, .001492, .0012709, 9.8081e-4,
      8.5063e-4, 6.8822e-4, 5.3809e-4, 4.4679e-4, 3.3774e-4, 2.7979e-4,
      2.1047e-4, 1.6511e-4, 1.2993e-4, 9.3033e-5, 7.436e-5, 5.6428e-5,
      4.5442e-5, 3.4575e-5, 2.7903e-5, 2.1374e-5, 1.6075e-5, 1.3022e-5,
      1.0962e-5, 8.5959e-6, 6.9125e-6, 5.3808e-6, 4.3586e-6, 3.6394e-6,
      2.9552e-6, 2.3547e-6, 1.8463e-6, 1.6036e-6, 1.3483e-6, 1.1968e-6,
      1.0333e-6, 8.4484e-7, 6.7195e-7, 5.0947e-7, 4.2343e-7, 3.4453e-7,
      2.783e-7, 2.3063e-7, 1.9951e-7, 1.7087e-7, 1.4393e-7, 1.2575e-7,
      1.075e-7, 8.2325e-8, 5.7524e-8, 4.4482e-8, 3.8106e-8, 3.4315e-8,
      2.9422e-8, 2.5069e-8, 2.2402e-8, 1.9349e-8, 1.6152e-8, 1.2208e-8,
      8.966e-9, 7.1322e-9, 6.1028e-9, 5.2938e-9, 4.535e-9, 3.4977e-9,
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       1.3612e-9, 1.5829e-9, 1.8655e-9, 2.1465e-9, 2.4779e-9, 2.737e-9,
      2.9915e-9, 3.3037e-9, 3.6347e-9, 3.9587e-9, 4.4701e-9, 5.0122e-9,
      5.8044e-9, 6.1916e-9, 6.9613e-9, 7.7863e-9, 8.282e-9, 9.4359e-9,
      9.7387e-9, 1.0656e-8, 1.0746e-8, 1.121e-8, 1.1905e-8, 1.2194e-8,
      1.3145e-8, 1.3738e-8, 1.3634e-8, 1.3011e-8, 1.2511e-8, 1.1805e-8,
      1.2159e-8, 1.239e-8, 1.3625e-8, 1.5678e-8, 1.7886e-8, 1.9933e-8,
      1.9865e-8, 1.9e-8, 1.7812e-8, 1.5521e-8, 1.2593e-8, 9.5635e-9,
      7.2987e-9, 5.2489e-9, 3.5673e-9, 2.4206e-9, 1.6977e-9, 1.2456e-9,
      9.3744e-10, 7.8379e-10, 6.996e-10, 6.6451e-10, 6.8521e-10,
      7.4234e-10, 8.6658e-10, 9.4972e-10, 1.0791e-9, 1.2359e-9,
      1.3363e-9, 1.5025e-9, 1.5368e-9, 1.6152e-9, 1.6184e-9, 1.6557e-9,
      1.7035e-9, 1.6916e-9, 1.7237e-9, 1.7175e-9, 1.6475e-9, 1.5335e-9,
      1.4272e-9, 1.3282e-9, 1.3459e-9, 1.4028e-9, 1.5192e-9, 1.7068e-9,
      1.9085e-9, 2.1318e-9, 2.102e-9, 1.9942e-9, 1.8654e-9, 1.6391e-9,
      1.3552e-9, 1.0186e-9, 7.854e-10, 5.7022e-10, 3.9247e-10,
      2.5441e-10, 1.6699e-10, 1.1132e-10, 6.8989e-11, 4.5255e-11,
      3.1106e-11, 2.3161e-11, 1.7618e-11, 1.438e-11, 1.1601e-11,
      9.7148e-12, 8.4519e-12, 6.5392e-12, 5.4113e-12, 4.7624e-12,
      4.0617e-12, 3.6173e-12, 2.8608e-12, 2.2724e-12, 1.7436e-12,
      1.3424e-12, 1.0358e-12, 7.3064e-13, 5.45e-13, 4.0551e-13,
      2.8642e-13, 2.1831e-13, 1.686e-13, 1.2086e-13, 1.015e-13,
      9.355e-14, 8.4105e-14, 7.3051e-14, 6.9796e-14, 7.9949e-14,
      1.0742e-13, 1.5639e-13, 2.1308e-13, 3.1226e-13, 4.6853e-13,
      6.6917e-13, 1.0088e-12, 1.4824e-12, 2.2763e-12, 3.3917e-12,
      4.4585e-12, 6.3187e-12, 8.4189e-12, 1.1302e-11, 1.3431e-11,
      1.5679e-11, 1.9044e-11, 2.2463e-11, 2.3605e-11, 2.3619e-11,
      2.3505e-11, 2.3805e-11, 2.2549e-11, 1.9304e-11, 1.8382e-11,
      1.7795e-11, 1.8439e-11, 1.9146e-11, 2.1966e-11, 2.6109e-11,
      3.1883e-11, 3.7872e-11, 4.3966e-11, 4.8789e-11, 5.3264e-11,
      5.9705e-11, 6.3744e-11, 7.0163e-11, 7.9114e-11, 8.8287e-11,
      9.9726e-11, 1.1498e-10, 1.37e-10, 1.6145e-10, 1.9913e-10,
      2.2778e-10, 2.6216e-10, 2.977e-10, 3.3405e-10, 3.7821e-10,
      3.9552e-10, 4.1322e-10, 4.0293e-10, 4.0259e-10, 3.8853e-10,
      3.7842e-10, 3.8551e-10, 4.4618e-10, 5.0527e-10, 5.0695e-10,
      5.1216e-10, 5.193e-10, 5.5794e-10, 5.332e-10, 5.2008e-10,
      5.6888e-10, 6.1883e-10, 6.9006e-10, 6.9505e-10, 6.6768e-10,
      6.329e-10, 5.6753e-10, 5.0327e-10, 3.983e-10, 3.1147e-10,
      2.4416e-10, 1.886e-10, 1.3908e-10, 9.9156e-11, 7.3779e-11,
      5.6048e-11, 4.2457e-11, 3.4505e-11, 2.9881e-11, 2.7865e-11,
      2.8471e-11, 3.1065e-11, 3.4204e-11, 3.914e-11, 4.3606e-11,
      4.9075e-11, 5.3069e-11, 5.5236e-11, 5.5309e-11, 5.3832e-11,
      5.3183e-11, 5.1783e-11, 5.2042e-11, 5.4422e-11, 5.5656e-11,
      5.4409e-11, 5.2659e-11, 5.1696e-11, 5.1726e-11, 4.9003e-11,
      4.905e-11, 5.17e-11, 5.6818e-11, 6.3129e-11, 6.6542e-11,
      6.4367e-11, 5.9908e-11, 5.447e-11, 4.7903e-11, 3.9669e-11,
      2.9651e-11, 2.2286e-11, 1.6742e-11, 1.1827e-11, 7.7739e-12,
      4.8805e-12, 3.1747e-12, 2.0057e-12, 1.255e-12, 8.7434e-13,
      6.2755e-13, 4.9752e-13, 4.0047e-13, 3.5602e-13, 3.093e-13,
      2.4903e-13, 1.9316e-13, 1.4995e-13, 1.2059e-13, 8.7242e-14,
      6.4511e-14, 5.33e-14, 4.3741e-14, 3.4916e-14, 2.656e-14,
      1.6923e-14, 1.1816e-14, 6.7071e-15, 3.6474e-15, 2.0686e-15,
      1.1925e-15, 6.8948e-16, 3.9661e-16, 2.2576e-16, 1.2669e-16,
      6.9908e-17, 3.7896e-17, 2.028e-17, 1.1016e-17, 6.7816e-18,
      6.0958e-18, 8.9913e-18, 1.7201e-17, 3.4964e-17, 7.0722e-17,
      1.402e-16, 2.7167e-16, 5.1478e-16, 9.55e-16, 1.7376e-15,
      3.1074e-15, 5.4789e-15, 9.564e-15, 1.6635e-14, 2.9145e-14,
      5.2179e-14, 8.8554e-14, 1.4764e-13, 2.3331e-13, 3.5996e-13,
      5.2132e-13, 6.3519e-13, 7.3174e-13, 8.3752e-13, 9.8916e-13,
      1.1515e-12, 1.4034e-12, 1.6594e-12, 2.1021e-12, 2.7416e-12,
      3.4135e-12, 4.5517e-12, 5.5832e-12, 7.2303e-12, 9.9484e-12,
      1.2724e-11, 1.6478e-11, 2.0588e-11, 2.5543e-11, 3.3625e-11,
      4.1788e-11, 5.0081e-11, 6.0144e-11, 6.9599e-11, 8.4408e-11,
      9.7143e-11, 1.0805e-10, 1.1713e-10, 1.2711e-10, 1.3727e-10,
      1.4539e-10, 1.6049e-10, 1.768e-10, 2.0557e-10, 2.4967e-10,
      3.0096e-10, 3.5816e-10, 4.0851e-10, 4.6111e-10, 5.2197e-10,
      5.5043e-10, 6.0324e-10, 6.4983e-10, 6.7498e-10, 7.0545e-10,
      7.068e-10, 7.5218e-10, 7.5723e-10, 7.784e-10, 8.0081e-10,
      8.0223e-10, 7.7271e-10, 7.1676e-10, 6.7819e-10, 6.4753e-10,
      6.5844e-10, 7.0163e-10, 7.7503e-10, 8.8152e-10, 9.9022e-10,
      1.0229e-9, 9.9296e-10, 8.9911e-10, 7.7813e-10, 6.3785e-10,
      4.7491e-10, 3.528e-10, 2.4349e-10, 1.6502e-10, 1.1622e-10,
      8.6715e-11, 6.736e-11, 5.391e-11, 4.5554e-11, 4.13e-11,
      3.9728e-11, 3.9e-11, 3.9803e-11, 4.1514e-11, 4.3374e-11,
      4.6831e-11, 4.8921e-11, 5.1995e-11, 5.7242e-11, 6.2759e-11,
      7.0801e-11, 7.4555e-11, 7.9754e-11, 8.7616e-11, 9.1171e-11,
      1.0349e-10, 1.1047e-10, 1.2024e-10, 1.299e-10, 1.3725e-10,
      1.5005e-10, 1.5268e-10, 1.5535e-10, 1.5623e-10, 1.5009e-10,
      1.4034e-10, 1.3002e-10, 1.2225e-10, 1.1989e-10, 1.2411e-10,
      1.3612e-10, 1.5225e-10, 1.7202e-10, 1.9471e-10, 1.9931e-10,
      1.9079e-10, 1.7478e-10, 1.5259e-10, 1.2625e-10, 9.3332e-11,
      6.8796e-11, 4.6466e-11, 2.9723e-11, 1.8508e-11, 1.2106e-11,
      8.0142e-12, 5.4066e-12, 3.9329e-12, 3.1665e-12, 2.742e-12,
      2.3996e-12, 2.3804e-12, 2.3242e-12, 2.4476e-12, 2.5331e-12,
      2.3595e-12, 2.2575e-12, 2.1298e-12, 2.0088e-12, 1.8263e-12,
      1.6114e-12, 1.4422e-12, 1.2946e-12, 1.0837e-12, 9.1282e-13,
      7.2359e-13, 5.3307e-13, 3.8837e-13, 2.6678e-13, 1.6769e-13,
      1.0826e-13, 7.2364e-14, 4.5201e-14, 3.0808e-14, 2.2377e-14,
      1.704e-14, 9.2181e-15, 5.2934e-15, 3.5774e-15, 3.1431e-15,
      3.7647e-15, 5.6428e-15, 9.5139e-15, 1.7322e-14, 2.8829e-14,
      4.7708e-14, 6.9789e-14, 9.7267e-14, 1.4662e-13, 1.9429e-13,
      2.5998e-13, 3.6636e-13, 4.796e-13, 6.5129e-13, 7.7638e-13,
      9.3774e-13, 1.1467e-12, 1.3547e-12, 1.5686e-12, 1.6893e-12,
      1.9069e-12, 2.1352e-12, 2.3071e-12, 2.4759e-12, 2.8247e-12,
      3.4365e-12, 4.3181e-12, 5.6107e-12, 7.0017e-12, 8.6408e-12,
      1.0974e-11, 1.3742e-11, 1.6337e-11, 2.0157e-11, 2.3441e-11,
      2.6733e-11, 3.0247e-11, 3.3737e-11, 3.8618e-11, 4.1343e-11,
      4.387e-11, 4.4685e-11, 4.4881e-11, 4.5526e-11, 4.3628e-11,
      4.4268e-11, 4.6865e-11, 5.3426e-11, 5.402e-11, 5.3218e-11,
      5.4587e-11, 5.636e-11, 5.774e-11, 5.6426e-11, 6.0399e-11,
      6.6981e-11, 7.4319e-11, 7.7977e-11, 7.5539e-11, 7.161e-11,
      6.4606e-11, 5.5498e-11, 4.3944e-11, 3.3769e-11, 2.5771e-11,
      1.9162e-11, 1.3698e-11, 1.0173e-11, 7.8925e-12, 6.1938e-12,
      4.7962e-12, 4.0811e-12, 3.3912e-12, 2.8625e-12, 2.4504e-12,
      2.2188e-12, 2.2139e-12, 2.2499e-12, 2.2766e-12, 2.3985e-12,
      2.5459e-12, 2.9295e-12, 3.4196e-12, 3.6155e-12, 4.0733e-12,
      4.461e-12, 4.9372e-12, 5.4372e-12, 5.7304e-12, 6.164e-12,
      6.1278e-12, 6.294e-12, 6.4947e-12, 6.8174e-12, 7.519e-12,
      8.2608e-12, 8.4971e-12, 8.3484e-12, 8.1888e-12, 7.8552e-12,
      7.8468e-12, 7.5943e-12, 7.9096e-12, 8.6869e-12, 9.1303e-12,
      9.2547e-12, 8.9322e-12, 8.2177e-12, 7.3408e-12, 5.7956e-12,
      4.447e-12, 3.5881e-12, 2.6748e-12, 1.7074e-12, 9.67e-13,
      5.2645e-13, 2.9943e-13, 1.7316e-13, 1.0039e-13, 5.7859e-14,
      3.2968e-14, 1.8499e-14, 1.0192e-14, 5.5015e-15, 2.904e-15,
      1.4968e-15, 7.5244e-16, 3.6852e-16, 1.7568e-16, 8.1464e-17,
      3.6717e-17, 1.6076e-17, 6.8341e-18, 2.8195e-18, 1.1286e-18, 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 1.407e-18, 3.0405e-18, 6.4059e-18,
       1.3169e-17, 2.6443e-17, 5.1917e-17, 9.9785e-17, 1.8802e-16,
      3.4788e-16, 6.3328e-16, 1.137e-15, 2.0198e-15, 3.5665e-15,
      6.3053e-15, 1.1309e-14, 2.1206e-14, 3.2858e-14, 5.5165e-14,
      8.6231e-14, 1.2776e-13, 1.778e-13, 2.5266e-13, 3.6254e-13,
      5.1398e-13, 6.8289e-13, 8.7481e-13, 1.1914e-12, 1.6086e-12,
      2.0469e-12, 2.5761e-12, 3.4964e-12, 4.498e-12, 5.5356e-12,
      6.7963e-12, 8.572e-12, 1.07e-11, 1.2983e-11, 1.627e-11,
      1.9609e-11, 2.2668e-11, 2.5963e-11, 3.0918e-11, 3.493e-11,
      3.933e-11, 4.4208e-11, 4.6431e-11, 5.1141e-11, 5.4108e-11,
      5.8077e-11, 6.505e-11, 7.2126e-11, 8.1064e-11, 8.1973e-11,
      8.1694e-11, 8.3081e-11, 8.024e-11, 7.9225e-11, 7.6256e-11,
      7.8468e-11, 8.0041e-11, 8.1585e-11, 8.3485e-11, 8.3774e-11,
      8.587e-11, 8.6104e-11, 8.8516e-11, 9.0814e-11, 9.2522e-11,
      8.8913e-11, 7.8381e-11, 6.8568e-11, 5.6797e-11, 4.4163e-11,
      3.2369e-11, 2.3259e-11, 1.6835e-11, 1.1733e-11, 8.5273e-12,
      6.3805e-12, 4.8983e-12, 3.8831e-12, 3.261e-12, 2.8577e-12,
      2.521e-12, 2.2913e-12, 2.0341e-12, 1.8167e-12, 1.6395e-12,
      1.489e-12, 1.3516e-12, 1.2542e-12, 1.291e-12, 1.3471e-12,
      1.4689e-12, 1.5889e-12, 1.6989e-12, 1.8843e-12, 2.0902e-12,
      2.3874e-12, 2.7294e-12, 3.3353e-12, 4.0186e-12, 4.5868e-12,
      5.2212e-12, 5.8856e-12, 6.5991e-12, 7.2505e-12, 7.6637e-12,
      8.5113e-12, 9.4832e-12, 9.9678e-12, 1.0723e-11, 1.0749e-11,
      1.138e-11, 1.1774e-11, 1.1743e-11, 1.2493e-11, 1.2559e-11,
      1.2332e-11, 1.1782e-11, 1.1086e-11, 1.0945e-11, 1.1178e-11,
      1.2083e-11, 1.3037e-11, 1.473e-11, 1.645e-11, 1.7403e-11,
      1.7004e-11, 1.5117e-11, 1.3339e-11, 1.0844e-11, 8.0915e-12,
      5.6615e-12, 3.7196e-12, 2.5194e-12, 1.6569e-12, 1.1201e-12,
      8.2335e-13, 6.027e-13, 4.8205e-13, 4.1313e-13, 3.6243e-13,
      3.2575e-13, 2.773e-13, 2.5292e-13, 2.3062e-13, 2.1126e-13,
      2.1556e-13, 2.1213e-13, 2.2103e-13, 2.1927e-13, 2.0794e-13,
      1.9533e-13, 1.6592e-13, 1.4521e-13, 1.1393e-13, 8.3772e-14,
      6.2077e-14, 4.3337e-14, 2.7165e-14, 1.6821e-14, 9.5407e-15,
      5.3093e-15, 3.032e-15, 1.7429e-15, 9.9828e-16, 5.6622e-16,
      3.1672e-16, 1.7419e-16, 9.3985e-17, 4.9656e-17, 2.5652e-17,
      1.2942e-17, 6.3695e-18, 3.0554e-18, 1.4273e-18, -0., -0., -0.,
      -0., -0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.,
      0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0., 0.} };

struct s_fh2ob_ {
    double e_1[3];
    int e_2;
    } fh2ob_ = { {-20., 2e4, 10.}, 2003 };

struct s_sh2oa_ {
    double e_1[2003];
    } sh2oa_ = { {.11109, .10573, .10162, .10573, .11109, .12574, .13499,
      .14327, .15065, .15164, .15022, .13677, .13115, .12253, .11271,
      .1007, .087495, .080118, .06994, .062034, .056051, .047663,
      .04245, .03669, .033441, .030711, .025205, .022113, .01888,
      .016653, .014626, .012065, .010709, .0091783, .0077274, .0067302,
      .0056164, .0049089, .0041497, .0035823, .0031124, .0026414,
      .0023167, .0020156, .0017829, .0015666, .0013928, .0012338,
      .0010932, 9.7939e-4, 8.8241e-4, 7.9173e-4, 7.1296e-4, 6.4179e-4,
      5.8031e-4, 5.2647e-4, 4.7762e-4, 4.3349e-4, 3.9355e-4, 3.5887e-4,
      3.2723e-4, 2.9919e-4, 2.7363e-4, 2.5013e-4, 2.2876e-4, 2.0924e-4,
      1.9193e-4, 1.7618e-4, 1.6188e-4, 1.4891e-4, 1.3717e-4, 1.2647e-4,
      1.1671e-4, 1.0786e-4, 9.9785e-5, 9.235e-5, 8.5539e-5, 7.9377e-5,
      7.3781e-5, 6.8677e-5, 6.3993e-5, 5.9705e-5, 5.5788e-5, 5.2196e-5,
      4.8899e-5, 4.5865e-5, 4.3079e-5, 4.0526e-5, 3.8182e-5, 3.6025e-5,
      3.4038e-5, 3.2203e-5, 3.0511e-5, 2.8949e-5, 2.7505e-5, 2.617e-5,
      2.4933e-5, 2.3786e-5, 2.2722e-5, 2.1736e-5, 2.0819e-5, 1.9968e-5,
      1.9178e-5, 1.8442e-5, 1.776e-5, 1.7127e-5, 1.6541e-5, 1.5997e-5,
      1.5495e-5, 1.5034e-5, 1.4614e-5, 1.423e-5, 1.3883e-5, 1.3578e-5,
      1.3304e-5, 1.3069e-5, 1.2876e-5, 1.2732e-5, 1.2626e-5, 1.2556e-5,
      1.2544e-5, 1.2604e-5, 1.2719e-5, 1.2883e-5, 1.3164e-5, 1.3581e-5,
      1.4187e-5, 1.4866e-5, 1.5669e-5, 1.6717e-5, 1.8148e-5, 2.0268e-5,
      2.2456e-5, 2.5582e-5, 2.9183e-5, 3.3612e-5, 3.9996e-5, 4.6829e-5,
      5.5055e-5, 6.5897e-5, 7.536e-5, 8.7213e-5, 1.0046e-4, 1.1496e-4,
      1.2943e-4, 1.5049e-4, 1.6973e-4, 1.8711e-4, 2.0286e-4, 2.2823e-4,
      2.678e-4, 2.8766e-4, 3.1164e-4, 3.364e-4, 3.6884e-4, 3.9159e-4,
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      1.2336e-8, 1.2546e-8, 1.3065e-8, 1.409e-8, 1.5215e-8, 1.654e-8,
      1.6144e-8, 1.5282e-8, 1.4358e-8, 1.2849e-8, 1.0998e-8, 8.6956e-9,
      7.0881e-9, 5.5767e-9, 4.2792e-9, 3.2233e-9, 2.502e-9, 1.9985e-9,
      1.5834e-9, 1.3015e-9, 1.0948e-9, 9.4141e-10, 8.1465e-10,
      7.1517e-10, 6.2906e-10, 5.5756e-10, 4.9805e-10, 4.3961e-10,
      3.9181e-10, 3.5227e-10, 3.167e-10, 2.8667e-10, 2.5745e-10,
      2.3212e-10, 2.0948e-10, 1.897e-10, 1.7239e-10, 1.5659e-10,
      1.4301e-10, 1.3104e-10, 1.2031e-10, 1.1095e-10, 1.0262e-10,
      9.513e-11, 8.8595e-11, 8.2842e-11, 7.7727e-11, 7.3199e-11,
      6.9286e-11, 6.5994e-11, 6.3316e-11, 6.1244e-11, 5.9669e-11,
      5.8843e-11, 5.8832e-11, 5.9547e-11, 6.1635e-11, 6.4926e-11,
      7.0745e-11, 7.8802e-11, 8.6724e-11, 1.0052e-10, 1.1575e-10,
      1.3626e-10, 1.5126e-10, 1.6751e-10, 1.9239e-10, 2.1748e-10,
      2.2654e-10, 2.2902e-10, 2.324e-10, 2.4081e-10, 2.393e-10,
      2.2378e-10, 2.2476e-10, 2.2791e-10, 2.4047e-10, 2.5305e-10,
      2.8073e-10, 3.1741e-10, 3.6592e-10, 4.1495e-10, 4.6565e-10,
      5.099e-10, 5.5607e-10, 6.1928e-10, 6.6779e-10, 7.335e-10,
      8.1434e-10, 8.9635e-10, 9.9678e-10, 1.1256e-9, 1.2999e-9,
      1.4888e-9, 1.7642e-9, 1.9606e-9, 2.2066e-9, 2.4601e-9, 2.7218e-9,
      3.0375e-9, 3.1591e-9, 3.2852e-9, 3.2464e-9, 3.3046e-9, 3.271e-9,
      3.2601e-9, 3.3398e-9, 3.7446e-9, 4.0795e-9, 4.0284e-9, 4.0584e-9,
      4.1677e-9, 4.5358e-9, 4.4097e-9, 4.2744e-9, 4.5449e-9, 4.8147e-9,
      5.2656e-9, 5.2476e-9, 5.0275e-9, 4.7968e-9, 4.3654e-9, 3.953e-9,
      3.2447e-9, 2.6489e-9, 2.1795e-9, 1.788e-9, 1.4309e-9, 1.1256e-9,
      9.1903e-10, 7.6533e-10, 6.3989e-10, 5.5496e-10, 4.9581e-10,
      4.5722e-10, 4.3898e-10, 4.3505e-10, 4.3671e-10, 4.5329e-10,
      4.6827e-10, 4.9394e-10, 5.1122e-10, 5.1649e-10, 5.0965e-10,
      4.9551e-10, 4.8928e-10, 4.7947e-10, 4.7989e-10, 4.9071e-10,
      4.8867e-10, 4.726e-10, 4.5756e-10, 4.54e-10, 4.5993e-10,
      4.4042e-10, 4.3309e-10, 4.4182e-10, 4.6735e-10, 5.0378e-10,
      5.2204e-10, 5.0166e-10, 4.6799e-10, 4.3119e-10, 3.8803e-10,
      3.3291e-10, 2.6289e-10, 2.1029e-10, 1.7011e-10, 1.3345e-10,
      1.0224e-10, 7.8207e-11, 6.2451e-11, 5.0481e-11, 4.1507e-11,
      3.5419e-11, 3.0582e-11, 2.69e-11, 2.3778e-11, 2.1343e-11,
      1.9182e-11, 1.7162e-11, 1.5391e-11, 1.3877e-11, 1.2619e-11,
      1.145e-11, 1.0461e-11, 9.6578e-12, 8.9579e-12, 8.3463e-12,
      7.8127e-12, 7.3322e-12, 6.9414e-12, 6.6037e-12, 6.3285e-12,
      6.1095e-12, 5.9387e-12, 5.8118e-12, 5.726e-12, 5.6794e-12,
      5.6711e-12, 5.7003e-12, 5.767e-12, 5.8717e-12, 6.0151e-12,
      6.1984e-12, 6.4232e-12, 6.6918e-12, 7.0065e-12, 7.3705e-12,
      7.7873e-12, 8.2612e-12, 8.7972e-12, 9.4009e-12, 1.0079e-11,
      1.084e-11, 1.1692e-11, 1.2648e-11, 1.3723e-11, 1.4935e-11,
      1.6313e-11, 1.7905e-11, 1.974e-11, 2.1898e-11, 2.4419e-11,
      2.7426e-11, 3.0869e-11, 3.4235e-11, 3.7841e-11, 4.1929e-11,
      4.6776e-11, 5.2123e-11, 5.8497e-11, 6.5294e-11, 7.4038e-11,
      8.4793e-11, 9.6453e-11, 1.1223e-10, 1.2786e-10, 1.4882e-10,
      1.7799e-10, 2.0766e-10, 2.4523e-10, 2.8591e-10, 3.3386e-10,
      4.0531e-10, 4.7663e-10, 5.4858e-10, 6.3377e-10, 7.1688e-10,
      8.4184e-10, 9.5144e-10, 1.0481e-9, 1.1356e-9, 1.2339e-9,
      1.3396e-9, 1.4375e-9, 1.5831e-9, 1.7323e-9, 1.9671e-9, 2.2976e-9,
      2.6679e-9, 3.0777e-9, 3.4321e-9, 3.8192e-9, 4.2711e-9, 4.4903e-9,
      4.8931e-9, 5.2253e-9, 5.404e-9, 5.6387e-9, 5.6704e-9, 6.0345e-9,
      6.1079e-9, 6.2576e-9, 6.4039e-9, 6.3776e-9, 6.1878e-9, 5.8616e-9,
      5.7036e-9, 5.584e-9, 5.6905e-9, 5.8931e-9, 6.2478e-9, 6.8291e-9,
      7.4528e-9, 7.6078e-9, 7.3898e-9, 6.7573e-9, 5.9827e-9, 5.0927e-9,
      4.0099e-9, 3.1933e-9, 2.4296e-9, 1.8485e-9, 1.4595e-9, 1.2017e-9,
      1.0164e-9, 8.7433e-10, 7.7108e-10, 7.0049e-10, 6.5291e-10,
      6.1477e-10, 5.9254e-10, 5.815e-10, 5.7591e-10, 5.849e-10,
      5.8587e-10, 5.9636e-10, 6.2408e-10, 6.5479e-10, 7.048e-10,
      7.2313e-10, 7.5524e-10, 8.0863e-10, 8.3386e-10, 9.2342e-10,
      9.6754e-10, 1.0293e-9, 1.0895e-9, 1.133e-9, 1.221e-9, 1.2413e-9,
      1.2613e-9, 1.2671e-9, 1.2225e-9, 1.1609e-9, 1.0991e-9, 1.06e-9,
      1.057e-9, 1.0818e-9, 1.1421e-9, 1.227e-9, 1.337e-9, 1.4742e-9,
      1.4946e-9, 1.4322e-9, 1.321e-9, 1.1749e-9, 1.0051e-9, 7.8387e-10,
      6.1844e-10, 4.6288e-10, 3.4164e-10, 2.5412e-10, 1.9857e-10,
      1.5876e-10, 1.2966e-10, 1.092e-10, 9.4811e-11, 8.3733e-11,
      7.3906e-11, 6.7259e-11, 6.1146e-11, 5.7119e-11, 5.3546e-11,
      4.8625e-11, 4.4749e-11, 4.1089e-11, 3.7825e-11, 3.4465e-11,
      3.1018e-11, 2.8109e-11, 2.561e-11, 2.2859e-11, 2.049e-11,
      1.8133e-11, 1.5835e-11, 1.3949e-11, 1.2295e-11, 1.0799e-11,
      9.6544e-12, 8.7597e-12, 7.999e-12, 7.3973e-12, 6.9035e-12,
      6.4935e-12, 6.1195e-12, 5.8235e-12, 5.5928e-12, 5.4191e-12,
      5.2993e-12, 5.2338e-12, 5.2272e-12, 5.2923e-12, 5.4252e-12,
      5.6523e-12, 5.9433e-12, 6.3197e-12, 6.9016e-12, 7.5016e-12,
      8.2885e-12, 9.405e-12, 1.0605e-11, 1.2257e-11, 1.3622e-11,
      1.5353e-11, 1.7543e-11, 1.9809e-11, 2.2197e-11, 2.4065e-11,
      2.6777e-11, 2.9751e-11, 3.2543e-11, 3.5536e-11, 3.9942e-11,
      4.6283e-11, 5.4556e-11, 6.549e-11, 7.6803e-11, 9.0053e-11,
      1.0852e-10, 1.2946e-10, 1.4916e-10, 1.7748e-10, 2.0073e-10,
      2.2485e-10, 2.5114e-10, 2.7715e-10, 3.1319e-10, 3.3305e-10,
      3.5059e-10, 3.5746e-10, 3.6311e-10, 3.7344e-10, 3.6574e-10,
      3.7539e-10, 3.9434e-10, 4.351e-10, 4.334e-10, 4.2588e-10,
      4.3977e-10, 4.6062e-10, 4.7687e-10, 4.6457e-10, 4.8578e-10,
      5.2344e-10, 5.6752e-10, 5.8702e-10, 5.6603e-10, 5.3784e-10,
      4.9181e-10, 4.3272e-10, 3.5681e-10, 2.8814e-10, 2.332e-10,
      1.8631e-10, 1.4587e-10, 1.1782e-10, 9.8132e-11, 8.2528e-11,
      6.9174e-11, 6.1056e-11, 5.3459e-11, 4.7116e-11, 4.1878e-11,
      3.8125e-11, 3.6347e-11, 3.5071e-11, 3.3897e-11, 3.3541e-11,
      3.3563e-11, 3.5469e-11, 3.8111e-11, 3.8675e-11, 4.1333e-11,
      4.3475e-11, 4.6476e-11, 4.9761e-11, 5.138e-11, 5.4135e-11,
      5.3802e-11, 5.5158e-11, 5.6864e-11, 5.9311e-11, 6.3827e-11,
      6.7893e-11, 6.823e-11, 6.6694e-11, 6.6018e-11, 6.4863e-11,
      6.5893e-11, 6.3813e-11, 6.4741e-11, 6.863e-11, 7.0255e-11,
      7.0667e-11, 6.881e-11, 6.4104e-11, 5.8136e-11, 4.7242e-11,
      3.7625e-11, 3.1742e-11, 2.5581e-11, 1.8824e-11, 1.3303e-11,
      9.6919e-12, 7.5353e-12, 6.0986e-12, 5.0742e-12, 4.3094e-12,
      3.719e-12, 3.252e-12, 2.8756e-12, 2.568e-12, 2.3139e-12,
      2.1025e-12, 1.9257e-12, 1.7777e-12, 1.6539e-12, 1.5508e-12,
      1.4657e-12, 1.3966e-12, 1.3417e-12, 1.2998e-12, 1.27e-12,
      1.2514e-12, 1.2437e-12, 1.2463e-12, 1.2592e-12, 1.2823e-12,
      1.3157e-12, 1.3596e-12, 1.4144e-12, 1.4806e-12, 1.5588e-12,
      1.6497e-12, 1.7544e-12, 1.8738e-12, 2.0094e-12, 2.1626e-12,
      2.3354e-12, 2.5297e-12, 2.7483e-12, 2.9941e-12, 3.2708e-12,
      3.5833e-12, 3.9374e-12, 4.3415e-12, 4.8079e-12, 5.3602e-12,
      5.9816e-12, 6.7436e-12, 7.6368e-12, 8.6812e-12, 9.8747e-12,
      1.135e-11, 1.3181e-11, 1.5406e-11, 1.7868e-11, 2.0651e-11,
      2.4504e-11, 2.9184e-11, 3.4159e-11, 3.9979e-11, 4.8704e-11,
      5.7856e-11, 6.7576e-11, 7.9103e-11, 9.437e-11, 1.1224e-10,
      1.3112e-10, 1.5674e-10, 1.8206e-10, 2.0576e-10, 2.3187e-10,
      2.7005e-10, 3.0055e-10, 3.3423e-10, 3.6956e-10, 3.8737e-10,
      4.263e-10, 4.5154e-10, 4.8383e-10, 5.3582e-10, 5.8109e-10,
      6.3741e-10, 6.3874e-10, 6.387e-10, 6.5818e-10, 6.5056e-10,
      6.5291e-10, 6.3159e-10, 6.3984e-10, 6.4549e-10, 6.5444e-10,
      6.7035e-10, 6.7665e-10, 6.9124e-10, 6.8451e-10, 6.9255e-10,
      6.9923e-10, 7.0396e-10, 6.7715e-10, 6.0371e-10, 5.3774e-10,
      4.6043e-10, 3.7635e-10, 2.9484e-10, 2.2968e-10, 1.8185e-10,
      1.4191e-10, 1.1471e-10, 9.479e-11, 7.9613e-11, 6.7989e-11,
      5.9391e-11, 5.281e-11, 4.7136e-11, 4.2618e-11, 3.8313e-11,
      3.4686e-11, 3.1669e-11, 2.911e-11, 2.6871e-11, 2.5074e-11,
      2.4368e-11, 2.3925e-11, 2.4067e-11, 2.4336e-11, 2.4704e-11,
      2.5823e-11, 2.7177e-11, 2.9227e-11, 3.1593e-11, 3.573e-11,
      4.0221e-11, 4.3994e-11, 4.8448e-11, 5.3191e-11, 5.8552e-11,
      6.3458e-11, 6.6335e-11, 7.2457e-11, 7.9091e-11, 8.2234e-11,
      8.7668e-11, 8.7951e-11, 9.2952e-11, 9.6157e-11, 9.5926e-11,
      1.012e-10, 1.0115e-10, 9.9577e-11, 9.6633e-11, 9.2891e-11,
      9.3315e-11, 9.5584e-11, 1.0064e-10, 1.0509e-10, 1.1455e-10,
      1.2443e-10, 1.2963e-10, 1.2632e-10, 1.1308e-10, 1.0186e-10,
      8.588e-11, 6.7863e-11, 5.1521e-11, 3.778e-11, 2.8842e-11,
      2.2052e-11, 1.7402e-11, 1.4406e-11, 1.1934e-11, 1.0223e-11,
      8.9544e-12, 7.9088e-12, 7.0675e-12, 6.2222e-12, 5.6051e-12,
      5.0502e-12, 4.5578e-12, 4.2636e-12, 3.9461e-12, 3.7599e-12,
      3.5215e-12, 3.2467e-12, 3.0018e-12, 2.6558e-12, 2.3928e-12,
      2.0707e-12, 1.7575e-12, 1.5114e-12, 1.2941e-12, 1.1004e-12,
      9.5175e-13, 8.2894e-13, 7.3253e-13, 6.5551e-13, 5.9098e-13,
      5.3548e-13, 4.8697e-13, 4.4413e-13, 4.06e-13, 3.7188e-13,
      3.4121e-13, 3.1356e-13, 2.8856e-13, 2.659e-13, 2.4533e-13,
      2.2663e-13, 2.096e-13, 1.9407e-13, 1.799e-13, 1.6695e-13,
      1.5512e-13, 1.4429e-13, 1.3437e-13, 1.2527e-13, 1.1693e-13,
      1.0927e-13, 1.0224e-13, 9.5767e-14, 8.9816e-14, 8.4335e-14,
      7.9285e-14, 7.4626e-14, 7.0325e-14, 6.6352e-14, 6.2676e-14,
      5.9274e-14, 5.6121e-14, 5.3195e-14, 5.0479e-14, 4.7953e-14,
      4.5602e-14, 4.3411e-14, 4.1367e-14, 3.9456e-14, 3.767e-14,
      3.5996e-14, 3.4427e-14, 3.2952e-14, 3.1566e-14, 3.0261e-14,
      2.903e-14, 2.7868e-14, 2.677e-14, 2.573e-14, 2.4745e-14,
      2.3809e-14, 2.2921e-14, 2.2076e-14, 2.1271e-14, 2.0504e-14,
      1.9772e-14, 1.9073e-14, 1.8404e-14, 1.7764e-14, 1.7151e-14,
      1.6564e-14, 1.6e-14, 1.5459e-14, 1.4939e-14, 1.4439e-14,
      1.3958e-14, 1.3495e-14, 1.3049e-14, 1.262e-14, 1.2206e-14,
      1.1807e-14, 1.1422e-14, 1.105e-14, 1.0691e-14, 1.0345e-14,
      1.001e-14, 9.687e-15, 9.3747e-15, 9.0727e-15, 8.7808e-15,
      8.4986e-15, 8.2257e-15, 7.9617e-15, 7.7064e-15, 7.4594e-15,
      7.2204e-15, 6.9891e-15, 6.7653e-15, 6.5488e-15, 6.3392e-15,
      6.1363e-15, 5.9399e-15, 5.7499e-15, 5.5659e-15, 5.3878e-15,
      5.2153e-15, 5.0484e-15, 4.8868e-15, 4.7303e-15, 4.5788e-15,
      4.4322e-15, 4.2902e-15, 4.1527e-15, 4.0196e-15, 3.8907e-15,
      3.7659e-15, 3.6451e-15, 3.5281e-15, 3.4149e-15, 3.3052e-15,
      3.1991e-15, 3.0963e-15, 2.9967e-15, 2.9004e-15, 2.8071e-15,
      2.7167e-15, 2.6293e-15, 2.5446e-15, 2.4626e-15, 2.3833e-15,
      2.3064e-15, 2.232e-15, 2.16e-15, 2.0903e-15, 2.0228e-15,
      1.9574e-15, 1.8942e-15, 1.8329e-15, 1.7736e-15, 1.7163e-15,
      1.6607e-15, 1.6069e-15, 1.5548e-15, 1.5044e-15, 1.4557e-15,
      1.4084e-15, 1.3627e-15, 1.3185e-15, 1.2757e-15, 1.2342e-15,
      1.1941e-15, 1.1552e-15, 1.1177e-15, 1.0813e-15, 1.0461e-15,
      1.012e-15, 9.79e-16, 9.4707e-16, 9.1618e-16, 8.8628e-16,
      8.5734e-16, 8.2933e-16, 8.0223e-16, 7.76e-16, 7.5062e-16,
      7.2606e-16, 7.0229e-16, 6.7929e-16, 6.5703e-16, 6.355e-16,
      6.1466e-16, 5.9449e-16, 5.7498e-16, 5.561e-16, 5.3783e-16,
      5.2015e-16, 5.0305e-16, 4.865e-16, 4.7049e-16, 4.55e-16,
      4.4002e-16, 4.2552e-16, 4.1149e-16, 3.9792e-16, 3.8479e-16,
      3.7209e-16, 3.5981e-16, 3.4792e-16, 3.3642e-16, 3.253e-16,
      3.1454e-16, 3.0413e-16, 2.9406e-16, 2.8432e-16, 2.749e-16,
      2.6579e-16, 2.5697e-16, 2.4845e-16, 2.402e-16, 2.3223e-16,
      2.2451e-16, 2.1705e-16, 2.0984e-16, 2.0286e-16, 1.9611e-16,
      1.8958e-16, 1.8327e-16, 1.7716e-16, 1.7126e-16, 1.6555e-16,
      1.6003e-16, 1.5469e-16, 1.4952e-16, 1.4453e-16, 1.397e-16,
      1.3503e-16 } };

struct s_sh2ob_ {
    double e_1[3];
    int e_2;
    } sh2ob_ = { {-20., 2e4, 10.}, 2003 };

struct s_s260a_ {
    double e_1[2003];
    } s260a_ = { {.1775, .17045, .16457, .17045, .1775, .20036, .21347, .22454,
       .23428, .23399, .23022, .20724, .19712, .18317, .16724, .1478,
      .12757, .11626, .10098, .089033, .07977, .067416, .059588,
      .051117, .046218, .042179, .034372, .029863, .025252, .022075,
      .019209, .015816, .013932, .011943, .010079, .0087667, .0074094,
      .0064967, .0055711, .0048444, .0042552, .0036953, .0032824,
      .0029124, .0026102, .002337, .00211, .0019008, .0017145, .0015573,
       .0014206, .0012931, .0011803, .0010774, 9.8616e-4, 9.0496e-4,
      8.3071e-4, 7.6319e-4, 7.0149e-4, 6.4637e-4, 5.9566e-4, 5.4987e-4,
      5.0768e-4, 4.688e-4, 4.3317e-4, 4.0037e-4, 3.7064e-4, 3.4325e-4,
      3.1809e-4, 2.9501e-4, 2.7382e-4, 2.543e-4, 2.363e-4, 2.1977e-4,
      2.0452e-4, 1.9042e-4, 1.774e-4, 1.6544e-4, 1.5442e-4, 1.4425e-4,
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      9.2451e-16, 8.9758e-16, 8.7142e-16, 8.4602e-16, 8.2136e-16,
      7.974e-16, 7.7414e-16, 7.5154e-16, 7.2961e-16, 7.083e-16,
      6.8761e-16, 6.6752e-16, 6.4801e-16, 6.2906e-16, 6.1066e-16,
      5.928e-16, 5.7545e-16, 5.586e-16, 5.4224e-16, 5.2636e-16,
      5.1094e-16, 4.9596e-16} };

struct s_s260b_ {
    double e_1[3];
    int e_2;
    } s260b_ = { {-20., 2e4, 10.}, 2003 };

struct s_consts_ {
    double e_1[9];
    } consts_ = { {3.1415927410125732, 6.62606876e-27, 1.3806503e-16,
      29979245800., 6.02214199e23, 2.6867775e19, 83144720.,
      1.191042722e-12, 1.4387752} };


/* Table of constant values */

/*
static integer c__9 = 9;
static integer c__1 = 1;
static integer c__2 = 2;
static integer c__5 = 5;
static int cs__0 = 0;
*/
// FIXME static double c_b125 = 0.;

/* ############################################################################ */
/*     path:    $Source: /srv/svn/cvs/cvsroot/arts/src/continua.cc,v $ */
/*     author:    $Author $ */
/*     revision:          $Revision: 1.39 $ */
/*     created:          $Date: 2006/06/30 08:35:33 $ */
/* ############################################################################ */

/* CKD2.4 TEST */
/* TKS, 2002-02-28 */
/* CALL : g77 -c testckd.f ; g77 testckd.o -o testckd */

/* ############################################################################ */
/* ----------------------------------------------------------------------------- */

/* INPUT PARAMETERS: */
/*  P          [hPa]  TOTAL PRESSURE */
/*  T          [K]    TEMPERATURE */
/*  VMRH2O     [1]    H2O VOLUME MIXING RATIO */
/*  VMRN2      [1]    N2  VOLUME MIXING RATIO */
/*  VMRO2      [1]    O2  VOLUME MIXING RATIO */
/*  FREQ       [Hz]   FREQUENCY OF ABSORPTION CALCULATION */


/* OUTPUT PARAMETER: */
/*  artsckd_     [1/m]  ABSORPTION COEFFICIENT */

/* ----------------------------------------------------------------------------- */

double artsckd_(double p, double t, double vmrh2o,
  double vmrn2, double vmro2, double freq, int ivc)
{
    /* Initialized data */

    static double xslf = 1.;
    static double xfrg = 1.;
    static double xcn2 = 1.;

    /* System generated locals */
    double ret_val=0.0e0;
    // FIXME double d__1, d__2, d__3, d__4;

    /* Local variables */
    // FIXME int iosa;
    double w_wv__, oc_n2, radct;
    double w_other__, w_n2__, w_o2__;
    double of_wv, os_wv, p0, xn_wv__, t0, rhofac, wn, xn, xn0, tksvpt, rft;

    extern int initi_(double, double , double *,
          double *, double *, double *, double *,
          double *, double *, double *, double *,
          double *, double *);
    extern double fwv_(int , double , double *, double *,
           double *, double *, double *, double *);
    extern double swv_(int , double , double , double *, double *
           , double *, double *, double *, double *,
           double *);
    extern double conti_n2__(double , double , double *,
      double *, double *, double *, double *);


/*     PROGRAM:  MODM */
/*     ------- */

/*     AUTHOR: Sid-Ahmed Boukabara */
/*     ------ */

/*     AFFILIATION: ATMOSPHERIC AND ENVIRONMENTAL RESEARCH INC. */
/*     ----------- */

/*     DATE OF CREATION : October 1998 */
/*     ---------------- */

/*     AIM: This program is aimed at the calculation of the */
/*     ---  atmospheric optical depths. The spectral validity depends */
/*          only on the region covered by the file:"spectral_lines.dat" */
/*          The components treated here are the water vapor, the */
/*          oxygen, the ozone, the nitrogen and nitrogen dioxide. */

/*     - IVC      : Flag of contin. vers.: CKD2.4(if=2)  MPMf87/s93 (if=3) */
/*     - ICP      : Flag to take(if =1) or not (if=0) the line coupling */
/*     - NWN      : Number of wavenumbers to be treated */
/*     - WN       : Vector of NWN wavenumbers [in cm-1], one should note that */
/*                  this input could be a scalar (associated with NWN=1) */
/*     - NLAY     : Number of layers to be treated. */
/*     - P        : Vector of NLAY pressures (in mbar), one should note that */
/*                  this input could be a scalar (associated with NLAY=1) */
/*     - T        : Vector of NLAY temperatures [in Kelvin] */
/*     - W_WV     : Vector of NLAY water vapor column amounts [in molecules/cm2] */
/*     - W_O2     : Vector of NLAY oxygen column amounts [in molecules/cm2] */
/*     - W_N2     : Vector of NLAY nitrogen column amounts [in molecules/cm2] */
/*     - W_OTHER  : Vector of NLAY of other species column amounts [in molecules/cm2] */
/*     - CLW      : Vector of NLAY Cloud Liquid Water amounts [in kg/m2 or mm] */
/*                  When Cloud is present, the frequency must be consistent */
/*                  with Rayleigh absorption (no scattering performed in */
/*                  monortm). */
/*     - XSLF     : Scaling factor of the self WV continuum (usually XSLF=1) */
/*     - XFRG     : Scaling factor of the foreign WV continuum (usually XFRG=1) */
/*     - XCN2     : Scaling factor of the N2 continuum (usually XCN2=1) */
/*     - O        : An array of NWNxNLAY elts containing the total optical depths */
/*                  due to all the active species [in nepers] */
/*     - OS_WV    : An array of NWNxNLAY elts containing the water vapor optical */
/*                  depth (due to self continuum), [in Nepers] */
/*     - OF_WV    : An array of NWNxNLAY elts containing the water vapor optical */
/*                  depth (due to foreign continuum), [in Nepers] */
/*     - OC_N2    : An array of NWNxNLAY elts containing the nitrogen optical */
/*                  depth (due to continuum), [in Nepers] */
/*     - O_CLW    : An array of NWNxNLAY elts containing the CLW optical */
/*                  depth , [in Nepers] */

/*     History of the modifications: */
/*     ***************************** */
/*     - written in 1999 by Sid Ahmed Boukabara, Ross Hoffman */
/*   and Tony Clough. */
/*     - validated against ARM sondes in the */
/*   microwave spectrum (23.8 and 31.4 GHz). SAB, 2000. */
/*     - extended to more species by Sid Ahmed Boukabara in 03/2000. */
/*     - cleaned up and commented in 2001 for first public release. */
/*   Also put under CVS configuration management. SAB. */
/*     - Extended O2 lines to submillimeter. Extensive validation */
/*   by comparison to Rosenkranz model and MWR data. */
/*   Update of the LBLATM module (accepts inputs at pressure */
/*   grid, along with altitude grid). */
/*   Fixed the handling of N2 amount coming from LBLATM (which */
/*   depends on the number of molecules NMOL). */
/*   Adopted accurate constants values. */
/*   Sid Ahmed Boukabara. Dec 14th 2001. */
/*     - Updated on January 7th 2002. ARM option (INP=2) updated and */
/*       made more efficient after Jim's comments. (INP=3) option optimized. */
/*       WV line intensities modified in the microwave (see Tony's email). */

/*     Comments should be forwarded to Sid Ahmed Boukabara (sboukaba@aer.com) */
/*     or Tony Clough (clough@aer.com). */

/* ============================================================================ */


/* TKS functions: */

/*     scaling factor (SLF cont) */
/*     scaling factor (FRG cont) */
/*     scaling factor (N2 cont) */


    w_wv__ = 0.0e0;
    w_o2__ = 0.0e0;
    w_n2__ = 0.0e0;
    w_other__ = 0.0e0;
    ret_val = 0.0e0;
    rft = 0.0e0;
    os_wv = 0.0e0;
    of_wv = 0.0e0;
    oc_n2 = 0.0e0;

/*      ---INPUTS & GENERAL CONTROL PARAMETERS */

    /*     set H2O, O2 and N2 number density to column amount [molec/cm2] */
    /*     TKSVPT = P[Pa] / T[K] */
    tksvpt    = (p * 100.0) / t;
    /*     7.242923e16 = k_B [J/K] * 1.0e-6 [m^3/cm^3] */
    w_wv__    = vmrh2o * 7.242923e16 * tksvpt;
    w_o2__    = vmro2  * 7.242923e16 * tksvpt;
    w_n2__    = vmrn2  * 7.242923e16 * tksvpt;
    w_other__ = (1.0000E0-vmrh2o-vmro2-vmrn2) * 7.242923e16 * tksvpt;

      /*     frequency [Hz] to wave number [cm-1] */
    wn = freq / 29979245800.0;
    //cout << "CKD2.4 H2O column amounts    [molec/cm2] =" << w_wv__ << "\n";
    //cout << "CKD2.4 O2 column amounts     [molec/cm2] =" << w_o2__ << "\n";
    //cout << "CKD2.4 H2O column amounts    [molec/cm2] =" << w_n2__ << "\n";
    //cout << "CKD2.4 others column amounts [molec/cm2] =" << w_other__ << "\n";
    //cout << "freq=" << freq << " Hz,   wave num=" << wn << " cm-1\n";

/* ---------------------------------------------------------------------------- */

/*     --- INITIALIZATION ----------------------------------------- */
    initi_(p, t, &radct, &t0, &p0, &w_wv__, &w_o2__, &w_n2__, &w_other__, &
      xn0, &xn, &xn_wv__, &rhofac);
    //cout << "CKD2.4 t0=" << t0 << "  p0=" << p0 << "\n";
    //cout << "radct   =" << radct << "\n";
    //cout << "xn0     =" << xn0 << "\n";
    //cout << "xn      =" << xn << "\n";
    //cout << "xn_wv__ =" << xn_wv__ << "\n";
    //cout << "rhofac  =" << rhofac << "\n";

    /*     --- RAD_FIELD_TERM ----------------------------------------- */
    rft = wn * tanh(radct * wn / (t * 2));
    //cout << "rft =" << rft << "\n";

    /*     --- H2O CONTINUUM TERM ------------------------------------- */

    if (ivc == 21) {
      /* CKD2.4  CONT_SELF_WV [Np/m] */
  os_wv = 1.0000e2 * swv_(2, wn, t, &t0, &w_wv__, &rft, &xn, &xn_wv__, &xn0, &xslf);
  //cout << "CKD2.4 ivc=21, H2O self cont  [in Np/m]   =" << os_wv << "\n";
  return os_wv;
    }
    if (ivc == 31) {
      /* MPMf87/s93  CONT_SELF_WV [Np/m] */
  os_wv = 1.0000e2 * swv_(3, wn, t, &t0, &w_wv__, &rft, &xn, &xn_wv__, &xn0, &xslf);
  //cout << "CKD2.4 ivc=31, H2O self cont  [in Np/m]   =" << os_wv << "\n";
  return os_wv;
    }
    if (ivc == 22) {
      /* CKD2.4  CONT_FRGN_WV [Np/m] */
  of_wv = 1.0000e2 * fwv_(2, wn, &w_wv__, &rft, &xn, &xn_wv__, &xn0, &xfrg);
  //cout << "CKD2.4 ivc=22, H2O foreign cont [in Np/m] =" << of_wv << "\n";
  return of_wv;
      }
    if (ivc == 32) {
      /* MPMf87/s93  CONT_FRGN_WV [Np/m] */
  of_wv = 1.0000e2 * fwv_(3, wn, &w_wv__, &rft, &xn, &xn_wv__, &xn0, &xfrg);
  //cout << "CKD2.4 ivc=32, H2O foreign cont [in Np/m] =" << of_wv << "\n";
  return of_wv ;
    }

    /* --- N2 CONTINUUM TERM [Np/m] ----------------------------------- */
    if (ivc == 1) {
  oc_n2 = 1.0000e2 * conti_n2__(wn, t, &t0, &w_n2__, &rft, &rhofac, &xcn2);
  //cout << "CKD2.4 ivc=1, N2 cont           [in Np/m] =" << oc_n2 << "\n";
  return oc_n2;
    }

    /* --- TOTAL ABSORPTION IN [in Np/m] --------------------------- */
    //    cout << "CKD2.4 H2O s+f cont         [in Np/m]         =" << ((os_wv+of_wv) * 1.0000e2) << "\n";
    //ret_val = ((os_wv + of_wv + oc_n2) * 1.0000e2);

// FIXME L999:

    return ret_val;  // [Np/m]
} /* artsckd_ */


/* ############################################################################ */
/*     foreign continuum functions -------------------------------------------- */
double fwv_(int ivc, double wn, double *w_wv__, double *rft,
      double *xn, double *xn_wv__, double *xn0, double *xfrg)
{
    /* System generated locals */
    double ret_val = 0.0e0;

    /* Local variables */
    extern double fwv24_(double , double *, double *,
      double *, double *, double *, double *),
      fwv_mpmf87s93__(double , double *, double *,
      double *, double *, double *, double *);

    ret_val = 0.0e0;

/*     --- CKD2.4 CONTINUUM ------------------------------------- */
    if (ivc == 2 && *w_wv__ > 0.) {
  ret_val = fwv24_(wn, w_wv__, rft, xn, xn_wv__, xn0, xfrg);
    }


/*     --- MPMf87s93 CONTINUUM ---------------------------------- */
    if (ivc == 3 && *w_wv__ > 0.) {
  ret_val = fwv_mpmf87s93__(wn, w_wv__, rft, xn, xn_wv__, xn0, xfrg);
    }

    return ret_val;
} /* fwv_ */

double fwv_mpmf87s93__(double wn, double *w_wv__, double *rft,
           double *xn, double *xn_wv__, double *xn0, double *xfrg)
{
    /* System generated locals */
    double ret_val=0.0e0;

    /* Local variables */
    extern double xlgr_(double *, double *);
    int i__, j;
    double x[4], fscal, xf;

    ret_val = 0.0e0;

    j = (int) ((wn - fh2ob_1.v1) / fh2ob_1.dv) + 1;

    for (i__ = 1; i__ <= 4; ++i__) {
  x[i__ - 1] = fh2oa_1.fh2o[j + i__ - 3];
    }

    xf = (wn - (fh2ob_1.v1 + fh2ob_1.dv * (double) (j - 1))) /
      fh2ob_1.dv;
    fscal = .8;
    ret_val = xlgr_(&xf, x) * 1e-20 * (*w_wv__ * *rft * ((*xn - *xn_wv__) / *
      xn0)) * fscal * *xfrg;

/* L999: */
    return ret_val;
} /* fwv_mpmf87s93__ */

double fwv24_(double wn, double *w_wv__, double *rft,
        double *xn, double *xn_wv__, double *xn0, double *
        xfrg)
{
    /* Initialized data */

  static double v0f1 = 350.;
  static double hwsqf1 = 4e4;
  static double betaf1 = 5e-9;
  static double factrf1 = -.7;
  static double v0f1a = 630.;
  static double hwsqf1a = 4225.;
  static double betaf1a = 2e-8;
  static double factrf1a = .75;
  static double v0f2 = 1130.;
  static double hwsqf2 = 108900.;
  static double betaf2 = 8e-11;
  static double factrf2 = -.97;
  static double v0f3 = 1975.;
  static double hwsqf3 = 62500.;
  static double betaf3 = 5e-6;
  static double factrf3 = -.65;

  /* System generated locals */
  double ret_val=0.0e0;
  double d__1;

  /* Local variables */
  extern double xlgr_(double *, double *);
  int i__, j;
  double x[4], fscal, xf, vf2, vf4, vf6;

  ret_val = 0.0e0;

  j = (int) ((wn - fh2ob_1.v1) / fh2ob_1.dv) + 1;
  for (i__ = 1; i__ <= 4; ++i__) {
    x[i__ - 1] = fh2oa_1.fh2o[j + i__ - 3];
  }

  xf = (wn - (fh2ob_1.v1 + fh2ob_1.dv * (double) (j - 1))) /
        fh2ob_1.dv;

/*     ---added correction to the forgn continuum */
/* Computing 2nd power */
    d__1  = wn - v0f1;
    vf2   = d__1 * d__1;
    vf6   = vf2 * vf2 * vf2;
    fscal = factrf1 * (hwsqf1 / (vf2 + betaf1 * vf6 + hwsqf1)) + 1.;
/* Computing 2nd power */
    d__1   = wn - v0f1a;
    vf2    = d__1 * d__1;
    vf6    = vf2 * vf2 * vf2;
    fscal *= factrf1a * (hwsqf1a / (vf2 + betaf1a * vf6 + hwsqf1a)) + 1.;
/* Computing 2nd power */
    d__1 = wn - v0f2;
    vf2 = d__1 * d__1;
    vf6 = vf2 * vf2 * vf2;
    fscal *= factrf2 * (hwsqf2 / (vf2 + betaf2 * vf6 + hwsqf2)) + 1.;
/* Computing 2nd power */
    d__1 = wn - v0f3;
    vf2 = d__1 * d__1;
    vf4 = vf2 * vf2;
    fscal *= factrf3 * (hwsqf3 / (vf2 + betaf3 * vf4 + hwsqf3)) + 1.;
    ret_val = xlgr_(&xf, x) * 1e-20 * (*w_wv__ * *rft * ((*xn - *xn_wv__) / *
      xn0)) * fscal * *xfrg;

/* L999: */
    return ret_val;
} /* fwv24_ */



/*     self continuum function ------------------------------------------------ */
double swv_(int ivc, double wn, double t, double *t0,
      double *w_wv__, double *rft, double *xn, double *
      xn_wv__, double *xn0, double *xslf)
{
  /* System generated locals */
  double ret_val;

    /* Local variables */
    extern double swv_mpmf87s93__(double , double , double *
          , double *, double *, double *, double *,
          double *, double *);
    extern double swv24_(double , double ,
       double *, double *, double *, double *,
       double *, double *, double *);

    ret_val = 0.;

/*     CKD2.4 CONTINUUM */
    if (ivc == 2 && *w_wv__ > 0.) {
/*     CNT_SLF_WV CKD2.4 */
  ret_val = swv24_(wn, t, t0, w_wv__, rft, xn, xn_wv__, xn0, xslf);
    }

    if (ivc == 3 && *w_wv__ > 0.) {
/*     MPMf87s93 CKD2.4 CONT. */
/*     CNT_SLF_WV */
  ret_val = swv_mpmf87s93__(wn, t, t0, w_wv__, rft, xn, xn_wv__, xn0,
    xslf);
    }

    return ret_val;
} /* swv_ */



double swv24_(double wn, double t, double *t0, double *
        w_wv__, double *rft, double * /* xn */, double *xn_wv__,
        double *xn0, double *xslf)
{
    /* Initialized data */

  static double v0s1 = 0.;
  static double hwsq1 = 1e4;
  static double betas1 = 1e-4;
  static double factrs1 = .688;
  static double v0s2 = 1050.;
  static double hwsq2 = 4e4;
  static double factrs2 = -.2333;
  static double v0s3 = 1310.;
  static double hwsq3 = 14400.;
  static double betas3 = 5e-6;
  static double factrs3 = -.15;

    /* System generated locals */
    double ret_val, d__1, d__2;

    /* Local variables */
    double sfac;
    extern double xlgr_(double *, double *);
    int j;
    double x[4], xf, vs2, vs4;

/*     ---UNITS(CM**3/MOL)*1.E-20 */

    ret_val = 0.;

    j = (int) ((wn - sh2ob_1.v1) / sh2ob_1.dv) + 1;
    d__1 = s260a_1.swv260[j - 2] / sh2oa_1.swv296[j - 2];
    d__2 = (t - *t0) / (260. - *t0);
    x[0] = sh2oa_1.swv296[j - 2] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j - 1] / sh2oa_1.swv296[j - 1];
    d__2 = (t - *t0) / (260. - *t0);
    x[1] = sh2oa_1.swv296[j - 1] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j] / sh2oa_1.swv296[j];
    d__2 = (t - *t0) / (260. - *t0);
    x[2] = sh2oa_1.swv296[j] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j + 1] / sh2oa_1.swv296[j + 1];
    d__2 = (t - *t0) / (260. - *t0);
    x[3] = sh2oa_1.swv296[j + 1] * pow(d__1, d__2);
    xf = (wn - (sh2ob_1.v1 + sh2ob_1.dv * (double) (j - 1))) /
      sh2ob_1.dv;
    sfac = 1.;
/* Computing 2nd power */
    d__1 = wn - v0s1;
    vs2 = d__1 * d__1;
    vs4 = vs2 * vs2;
/* Computing 2nd power */
    d__1 = wn;
    sfac *= factrs1 * (hwsq1 / (d__1 * d__1 + betas1 * vs4 + hwsq1)) + 1.;
/* Computing 2nd power */
    d__1 = wn - v0s2;
    vs2 = d__1 * d__1;
    sfac *= factrs2 * (hwsq2 / (vs2 + hwsq2)) + 1.;
/* Computing 2nd power */
    d__1 = wn - v0s3;
    vs2 = d__1 * d__1;
    vs4 = vs2 * vs2;
    sfac *= factrs3 * (hwsq3 / (vs2 + betas3 * vs4 + hwsq3)) + 1.;
    ret_val = *w_wv__ * *rft * (*xn_wv__ / *xn0) * xlgr_(&xf, x) * 1e-20 *
      sfac * *xslf;

    return ret_val;
} /* swv24_ */

double swv_mpmf87s93__(double wn, double t, double *t0,
  double *w_wv__, double *rft, double * /* xn */, double *
  xn_wv__, double *xn0, double *xslf)
{
    /* System generated locals */
    double ret_val, d__1, d__2;

    /* Local variables */
    double sfac;
    extern double xlgr_(double *, double *);
    int j;
    double x[4], xf;

/*     ---UNITS(CM**3/MOL)*1.E-20 */

    ret_val = 0.;

    j = (int) ((wn - sh2ob_1.v1) / sh2ob_1.dv) + 1;
    d__1 = s260a_1.swv260[j - 2] / sh2oa_1.swv296[j - 2];
    d__2 = (t - *t0) / (260. - *t0);
    x[0] = sh2oa_1.swv296[j - 2] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j - 1] / sh2oa_1.swv296[j - 1];
    d__2 = (t - *t0) / (260. - *t0);
    x[1] = sh2oa_1.swv296[j - 1] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j] / sh2oa_1.swv296[j];
    d__2 = (t - *t0) / (260. - *t0);
    x[2] = sh2oa_1.swv296[j] * pow(d__1, d__2);
    d__1 = s260a_1.swv260[j + 1] / sh2oa_1.swv296[j + 1];
    d__2 = (t - *t0) / (260. - *t0);
    x[3] = sh2oa_1.swv296[j + 1] * pow(d__1, d__2);
    xf = (wn - (sh2ob_1.v1 + sh2ob_1.dv * (double) (j - 1))) /
      sh2ob_1.dv;
    sfac = 3.;
    ret_val = *w_wv__ * *rft * (*xn_wv__ / *xn0) * xlgr_(&xf, x) * 1e-20 *
      sfac * *xslf;

/* L999: */
    return ret_val;
} /* swv_mpmf87s93__ */

/*     --- N2 continuum ------------------------------------------------------- */
double conti_n2__(double wn, double t, double *t0,
  double *w_n2__, double *rft, double *rhofac, double *
  xcn2)
{
    /* Initialized data */

    static double v1 = -10.;
    static double dv = 5.;
    static double ct296[73] = { 4.303e-7,4.85e-7,4.979e-7,4.85e-7,
      4.303e-7,3.715e-7,3.292e-7,3.086e-7,2.92e-7,2.813e-7,2.804e-7,
      2.738e-7,2.726e-7,2.724e-7,2.635e-7,2.621e-7,2.547e-7,2.428e-7,
      2.371e-7,2.228e-7,2.1e-7,1.991e-7,1.822e-7,1.697e-7,1.555e-7,
      1.398e-7,1.281e-7,1.138e-7,1.012e-7,9.078e-8,7.879e-8,6.944e-8,
      6.084e-8,5.207e-8,4.54e-8,3.897e-8,3.313e-8,2.852e-8,2.413e-8,
      2.045e-8,1.737e-8,1.458e-8,1.231e-8,1.031e-8,8.586e-9,7.162e-9,
      5.963e-9,4.999e-9,4.226e-9,3.607e-9,3.09e-9,2.669e-9,2.325e-9,
      2.024e-9,1.783e-9,1.574e-9,1.387e-9,1.236e-9,1.098e-9,9.777e-10,
      8.765e-10,7.833e-10,7.022e-10,6.317e-10,5.65e-10,5.1e-10,
      4.572e-10,4.115e-10,3.721e-10,3.339e-10,3.005e-10,2.715e-10,
      2.428e-10 };
    static double ct220[73] = { 4.946e-7,5.756e-7,5.964e-7,5.756e-7,
      4.946e-7,4.145e-7,3.641e-7,3.482e-7,3.34e-7,3.252e-7,3.299e-7,
      3.206e-7,3.184e-7,3.167e-7,2.994e-7,2.943e-7,2.794e-7,2.582e-7,
      2.468e-7,2.237e-7,2.038e-7,1.873e-7,1.641e-7,1.474e-7,1.297e-7,
      1.114e-7,9.813e-8,8.309e-8,7.059e-8,6.068e-8,5.008e-8,4.221e-8,
      3.537e-8,2.885e-8,2.407e-8,1.977e-8,1.605e-8,1.313e-8,1.057e-8,
      8.482e-9,6.844e-9,5.595e-9,4.616e-9,3.854e-9,3.257e-9,2.757e-9,
      2.372e-9,2.039e-9,1.767e-9,1.548e-9,1.346e-9,1.181e-9,1.043e-9,
      9.11e-10,8.103e-10,7.189e-10,6.314e-10,5.635e-10,4.976e-10,
      4.401e-10,3.926e-10,3.477e-10,3.085e-10,2.745e-10,2.416e-10,
      2.155e-10,1.895e-10,1.678e-10,1.493e-10,1.31e-10,1.154e-10,
      1.019e-10,8.855e-11 };

    /* System generated locals */
    double ret_val, d__1, d__2;

    /* Local variables */
    extern double xlgr_(double *, double *);
    int j;
    double x[4], xf;

/* TKS      INTEGER NPTCONTN2 */
/* TKS      INTEGER NPTCONTN2B */
/* TKS     &                 V1B,V2B,DVB */
/* TKS      DATA V2        / 350.0 / */
/* TKS      DATA NPTCONTN2 / 73    / */
/* TKS      DATA V1B, V2B, DVB, NPTCONTN2B / -10., 350., 5.0, 73 / */



    ret_val = 0.;
/* TKS  -- begin implementation of TKS */
    if (wn <= 0.) {
  ret_val = 0.;
  return ret_val;
    }
    if (wn > 350.) {
  ret_val = 0.;
  return ret_val;
    }
/* TKS  -- end implementation of TKS */

    if (*w_n2__ == 0.) {
  ret_val = 0.;
  return ret_val;
    }

    j = (int) ((wn - v1) / dv) + 1;
    d__1 = ct296[j - 2] / ct220[j - 2];
    d__2 = (t - *t0) / (220. - *t0);
    x[0] = ct296[j - 2] * pow(d__1, d__2);
    d__1 = ct296[j - 1] / ct220[j - 1];
    d__2 = (t - *t0) / (220. - *t0);
    x[1] = ct296[j - 1] * pow(d__1, d__2);
    d__1 = ct296[j] / ct220[j];
    d__2 = (t - *t0) / (220. - *t0);
    x[2] = ct296[j] * pow(d__1, d__2);
    d__1 = ct296[j + 1] / ct220[j + 1];
    d__2 = (t - *t0) / (220. - *t0);
    x[3] = ct296[j + 1] * pow(d__1, d__2);
    xf = (wn - (v1 + dv * (double) (j - 1))) / dv;
    ret_val = xlgr_(&xf, x) * 1e-20 * (*w_n2__ / .26867775 * *rft * *rhofac) *
       *xcn2;

    return ret_val;
} /* conti_n2__ */

/*     --- 4 points Lagrange interpolation ----------------------------------- */
double xlgr_(double *xf, double *x)
{
    /* System generated locals */
    double ret_val;

    /* Local variables */
    double a[4], b;




/*     with continous derivatives */
    /* Parameter adjustments */
    --x;

    /* Function Body */
    b = *xf * .5 * (1. - *xf);
    a[0] = -b * (1. - *xf);
    a[1] = 1. - (3. - *xf * 2.) * *xf * *xf + b * *xf;
    a[2] = (3. - *xf * 2.) * *xf * *xf + b * (1. - *xf);
    a[3] = -(b * *xf);
    ret_val = a[0] * x[1] + a[1] * x[2] + a[2] * x[3] + a[3] * x[4];

/* L999: */
    return ret_val;
} /* xlgr_ */

/*     --- initializations ---------------------------------------------------- */
int initi_(double p, double t, double *radct,
  double *t0, double *p0, double *w_wv__, double *
  w_o2__, double *w_n2__, double *w_other__, double *xn0,
  double *xn, double *xn_wv__, double *rhofac)
{
    /* Initialized data */

    static double wvmolmass = 18.016;
    static double drymolmass = 28.97;

    double wdry, ratiomix, wvpress;

/*     [K] */
    *t0 = 296.;
/*     [hPa] */
    *p0 = 1013.25;

/*     [K/cm-1] */
    *radct   = consts_1.planck * consts_1.clight / consts_1.boltz;
    *xn0     = *p0 / (consts_1.boltz * *t0) * 1e3;
    *xn      = p / (consts_1.boltz * t) * 1e3;
    wdry     = *w_o2__ + *w_n2__ + *w_other__;
    ratiomix = *w_wv__ * wvmolmass / (wdry * drymolmass);
    wvpress  = ratiomix / (ratiomix + wvmolmass / drymolmass) * p;
    *xn_wv__ = wvpress / (consts_1.boltz * t) * 1e3;
    *rhofac  = *w_n2__ / (wdry + *w_wv__) * (p / *p0) * (273.15 / t);

/* L999: */
    return 0;
} /* initi_ */

/* ############################################################################ */
/* ---Block data to be consistent with LBLRTM/LBLATM */
/* Subroutine */ int phys_consts__(void)
{
    return 0;
} /* phys_consts__ */


/*     Pi was obtained from PI = 2.*ASIN(1.) */
/* --------------------------------------------- */
/*       Constants from NIST 01/11/2002 */
/* --------------------------------------------- */
/* --------------------------------------------- */
/*       units are generally cgs */
/*       The first and second radiation constants are taken from NIST. */
/*       They were previously obtained from the relations: */
/*       RADCN1 = 2.*PLANCK*CLIGHT*CLIGHT*1.E-07 */
/*       RADCN2 = PLANCK*CLIGHT/BOLTZ */
/* --------------------------------------------- */

/* ############################################################################ */
/* Subroutine */ int bsa296_(void)
{
    return 0;
} /* bsa296_ */







/* Subroutine */ int bsb296_(void)
{
    return 0;
} /* bsb296_ */







/* ---------------------------------------------------------------------------- */


/* Subroutine */ int bs260a_(void)
{
    return 0;
} /* bs260a_ */








/* Subroutine */ int bs260b_(void)
{
    return 0;
} /* bs260b_ */







/* ---------------------------------------------------------------------------- */


/* Subroutine */ int bfh2oa_(void)
{
    return 0;
} /* bfh2oa_ */








/* Subroutine */ int bfh2ob_(void)
{
    return 0;
} /* bfh2ob_ */


// ---------------------- end of monortm CKD F77  code --------------------------

---