Synopsis
		sfpwdchain < inp.rsf dip=dip.rsf > out.rsf dipin=dipin.rsf nc=1 order=1 drift=n vp=n verb=(bool) (1 == nt) niter=0 liter=50 rect1=1 rect2=1 lambda=1.0f

Parameters
		file dip= auxiliary output file name   string dipin= auxiliary input file name   bool drift=n [y/n] if shift filter   float lambda=1.0f scaling   int liter=50 number of linear iterations   int nc=1 number of components   int niter=0 number of iterations   int order=1 PWD order   int rect1=1   int rect2=1 smoothing radius   bool verb=(bool) (1 == nt) [y/n] verbosity flag   bool vp=n [y/n] if use variable projection