Synopsis
		sfdagap3e < dagFile.rsf dips=dipFile.rsf > taperFile.rsf ddep=y pwidth1=10.f pwidth2=10.f greyarea1=10.f greyarea2=10.f dz=20.f

May be used for migration aperture optimization or for reflected energy
supression. For the last multiply the output on -1.

Input:
dagFile.rsf - input dip-angle gathers;
dipFile.rsf - dips esitimated in the image domain. The dips are in degree (!)

Output:
taperFile.rsf - mask for input dip-angle gathers

Parameters
		bool ddep=y [y/n] if y, taper depends on depth; if n, no   string dips= dips esitimated in the image domain (in degree) (auxiliary input file name)   float dz=20.f half of a migrated wave length   float greyarea1=10.f   float greyarea2=10.f width of event tail taper (in degree)   float pwidth1=10.f   float pwidth2=10.f protected width (in degree)