Program sfgaussmooth | Recursive Gaussian smoothing on the fast axis. 
[SYNOPSIS]
sfgaussmooth < in.rsf > out.rsf der=n rect=1 repeat=1
[PARAMETERS]
bool    | der | =n |  [y/n] | 	compute derivative 
float   | rect | =1 |   | 	smoothing radius 
int     | repeat | =1 |   | 	repeat filtering several times 
[DIRECTORY]
user/fomels
