Synopsis
		sfpef < in.rsf > filt.rsf maskin=mask.rsf a= center= gap= n= na=0 niter=2*(aa->nh) lag= maskout=

Parameters
		ints a= [dim]   ints center= [dim]   ints gap= [dim]   string lag= output file for filter lags   string maskin= optional input mask file (auxiliary input file name)   string maskout= optional output mask file   ints n= [dim]   int na=0 filter size   int niter=2*(aa->nh) number of iterations

Used In
		GEE          mda/morgan mda/geostat mda/hole mda/pefex mda/miss3 pch/signoi   SEP          precon/seab spitz/sign