Synopsis
		sferf < in.rsf > out.rsf flo=-1. fhi=-1. rect=1 spline=n der=n

Parameters
		bool der=n [y/n] compute derivative   float fhi=-1. high frequency in band   float flo=-1. low frequency in band   float rect=1 filter sharpness   bool spline=n [y/n] if use B-spline erf

Used In
		RSF          su/rsfkasper su/rsflab8