Synopsis
		sfffdtti4 > out.rsf velx=velx.rsf velz=velz.rsf yita=yita.rsf < source.rsf seta=seta.rsf opt=y dt= nt= isx= isz= alpha=-0.7 nbt=44 nbb=44 nbl=44 nbr=44 ct=0.01 cb=0.01 cl=0.01 cr=0.01 err=dx*dx

Parameters
		float alpha=-0.7   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=   float err=dx*dx decaying parameter   int isx=   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 seta= auxiliary input file name   file velx= auxiliary input file name   file velz= auxiliary input file name   file yita= auxiliary input file name