Synopsis
		sfrdiv < fnum.rsf den=fden.rsf > frat.rsf niter=100 niter2=1 verb=y eps=0.01 perc=50.0 fact=0.5

Parameters
		file den= auxiliary input file name   float eps=0.01 regularization   float fact=0.5 factor for sharpening   int niter=100 number of iterations   int niter2=1 number of outer iterations   float perc=50.0 percentage for sharpening   bool verb=y [y/n] verbosity