Synopsis
		sfmiss4 < in.rsf filt=fil.rsf > out.rsf mask=mask.rsf niter=100 exact=y eps=0. verb=n

Parameters
		float eps=0. regularization parameter   bool exact=y [y/n] If y, preserve the known data values   file filt= auxiliary input file name   string mask= optional input mask file for known data (auxiliary input file name)   int niter=100 Number of iterations   bool verb=n [y/n] verbosity flag