Synopsis
		sfcloudwin3d < Fin.rsf > Fou.rsf oo=Fo.rsf verb=n fast=y apt=15.0

3D CLoud WINdowing
Paul Sava
Copyright (C) 2022 Colorado School of Mines

Parameters
		float apt=15.0 aperture (deg)   bool fast=y [y/n] in-core windowing   file oo= auxiliary input file name   bool verb=n [y/n] verbosity