Synopsis
		sfpwdix < vrms.rsf > vint.rsf weight=weight.rsf slope=slope.rsf vrmsout=vout.rsf niter=100 ncycle=10 rect1=1 verb=n eps=0. order=1

Parameters
		float eps=0. regularization parameter   int ncycle=10 number of cycles for anisotropic diffusion   int niter=100 maximum number of iterations   int order=1 accuracy order   int rect1=1 vertical smoothing radius   file slope= auxiliary input file name   bool verb=n [y/n] verbosity flag   string vrmsout= optionally, output predicted vrms (auxiliary output file name)   file weight= auxiliary input file name