Program sfnfmiss | Missing data interpolation in freq domain. 
[SYNOPSIS]
sfnfmiss < in.rsf > out.rsf filt=filt.rsf mask=mask.rsf exact=y verb=n niter=n1 ty=
[PARAMETERS]
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 | =n1 |   | 	number of iterations 
string  | ty | = |   | 	Prediction type: all=backward+forward
bool    | verb | =n |  [y/n] | 	verbosity flag 
[DIRECTORY]
user/gchliu
