Synopsis
		sfsmoothder < in.rsf > der.rsf eps=0.2

Applies D/(I + eps*D'D)

Parameters
		float eps=0.2 smoothness parameter

Used In
		TCCS          anisodiff/simple attr/vecta ltft/vecta probdif/nankai t2dweak/alaska t2dweak/field t2dweak/grad t2dweak/slow timelapse/long1 varipick/newviking wetm/beivel wetm/nankaizone