Synopsis
		sfffdcos2bs > out.rsf vel=vel.rsf < source.rsf opt=y dt= nt= isx= isz= nb=30 c=0.01

Parameters
		float c=0.01 decaying parameter   float dt=   int isx=   int isz=   int nb=30   int nt=   bool opt=y [y/n] if y, determine optimal size for efficiency   file vel= auxiliary input file name