Synopsis
		sfpame2d vp=fvelp.rsf vs=fvels.rsf < fsource.rsf > fwavup.rsf wavwp=fwavwp.rsf wavus=fwavus.rsf wavws=fwavws.rsf wavu=fwavu.rsf wavw=fwavw.rsf opt=0 dt= nt= isx= isz= nbt=44 nbb=44 nxl=44 nxr=44 czt=0.01 czb=0.01 cxl=0.01 cxr=0.01 snap=1

Parameters
		float cxl=0.01 decaying parameter   float cxr=0.01 decaying parameter   float czb=0.01 decaying parameter   float czt=0.01 decaying parameter   float dt=   int isx=   int isz=   int nbb=44   int nbt=44   int nt=   int nxl=44   int nxr=44 assume ABC pars are the same   int opt=0 if y, determine optimal size for efficiency   int snap=1   file vp= auxiliary input file name   file vs= auxiliary input file name   file wavu= auxiliary output file name   file wavus= auxiliary output file name   file wavw= auxiliary output file name   file wavwp= auxiliary output file name   file wavws= auxiliary output file name