Synopsis
		sfawefd3dgpu < file_wav.rsf > file_dat.rsf vel=file_vel.rsf sou=file_src.rsf rec=file_rec.rsf den=file_den.rsf wfl=file_wfl.rsf verb=n nbd=20 snap=n cden=y jsnap=1

Parameters
		bool cden=y [y/n]   file den= auxiliary input file name   int jsnap=1   int nbd=20   file rec= auxiliary input file name   bool snap=n [y/n]   file sou= auxiliary input file name   file vel= auxiliary input file name   bool verb=n [y/n]   file wfl= auxiliary output file name