Synopsis
		sfsigmoid > mod.rsf n1=400 n2=100 large=5*n1 o1=0. o2=0. d1=0.004 d2=0.032 reflectivity=y taper=y

October 2014 program of the month:
http://ahay.org/blog/2014/10/08/program-of-the-month-sfsigmoid/

Parameters
		float d1=0.004   float d2=0.032 sampling   int large=5*n1 reflectivity series   int n1=400 vertical axis   int n2=100 horizontal axis   float o1=0.   float o2=0. origin   bool reflectivity=y [y/n] if output reflectivity (otherwise output impedance model)   bool taper=y [y/n] if taper the edges

Used In
		BEI          dwnc/sigmoid krch/sep73