Synopsis
		sfenvelope < in.rsf > out.rsf order=100 ref=1. hilb=n phase=90.

November 2011 program of the month:
http://ahay.org/rsflog/index.php?/archives/274-Program-of-the-month-sfenvelope.html

Parameters
		bool hilb=n [y/n] if y, compute Hilbert transform   int order=100 Hilbert transformer order   float phase=90. phase shift (in degrees) to use with hilb=y   float ref=1. Hilbert transformer reference (0.5 < ref <= 1)

Used In
		JSG          crs/dome2 flat/comaz flat/flat flat/flatelf pmig/mig pmig/nmo   MILANO          taupvel/cmp taupvel/synth   RSF          rsf/sfenvelope