Synopsis
		sfconjgrad < dat.rsf mod=mod.rsf > to.rsf < from.rsf > out.rsf niter=1

Parameters
		file mod= auxiliary input file name   int niter=1 number of iterations

Used In
		BEI          vela/stack   GEE          ajt/cunha lsq/invstack lsq/stest   SEP          stack/velinv