I want to calculate the free-free transitions using the close-coupling method, and it is said that M. J. seaton etc. have already developed a good procedure (module STGFF) to calculate the free-free transition(Free-free transitions and spectral-line broadening, M. J. seaton 2000,Journal of Physics B: Atomic, Molecular and Optical Physics), the mothod is almost completed, but I haven't found that procedure on the internet. Is it a freely procedure? or Is there any R-matrix procedure to calculate the free-free transition? I have a procedure which can calculate the bound-free transitions. and I don't wish to do repeated work on procedure modification. Thanks a lot.