Synopsis
		sffkgdmo < in.rsf > out.rsf inv=y shot=n eps=0.01 nb=85 db=1 xi=1

The input/ouput is (offset,logstretch frequency, midpoint/shot wavenumber).

Parameters
		float db=1 angle increment   float eps=0.01 stretch regularization   bool inv=y [y/n] inversion flag   int nb=85 number of angles   bool shot=n [y/n] if shot gathers instead of midpoint gathers   float xi=1 continuation paremeter