WIGXJPF python test program
3J(10  15  10; -3  12  -9): 0.0400138176828
6J{10  15  10;  7   7   9}: 0.0103314973434
9J{0.5 1 1.5; 2 3 4; 1.5 3 4.5}: -0.00301561193523