Synopsis
		sfagmig < in.rsf > out.rsf vel= ng= dg= g0= na=nx a=80.

Parameters
		float a=80. maximum dip angle   float dg= reflection angle sampling   float g0= reflection angle origin   int na=nx number of dip angles   int ng= number of reflection angles   float vel= velocity

Used In
		SEP          angle/agmig