WIGXJPF C++ test program
3J(10  15  10; -3  12  -9):              0.040013817682833
6J{10  15  10;  7   7   9}:              0.010331497343357
9J{0.5 1 1.5; 2 3 4; 1.5 3 4.5}:        -0.003015611935232