Synopsis
		sfitxmo < inp.rsf > out.rsf velocity=velocity.rsf inv=n nx= dx= x0=0. np= dp= p0=0. eps=0.01

Parameters
		float dp= slope sampling   float dx= offset sampling   float eps=0.01 stretch regularization   bool inv=n [y/n]   int np= slope samples   int nx= offset samples   float p0=0. first slope   file velocity= auxiliary input file name   float x0=0. first offset