Synopsis
		sfffd2b_rvr > out.rsf vel=vel.rsf < wave.rsf opt=y dt= nt= isz= nbt=44 nbb=44 nbl=44 nbr=44 ct=0.01 cb=0.01 cl=0.01 cr=0.01

Parameters
		float cb=0.01 decaying parameter   float cl=0.01 decaying parameter   float cr=0.01 decaying parameter   float ct=0.01 decaying parameter   float dt=   int isz=   int nbb=44   int nbl=44   int nbr=44   int nbt=44   int nt=   bool opt=y [y/n] if y, determine optimal size for efficiency   file vel= auxiliary input file name