Program sfshearer | Preconditioning for traveltime picking. 
[SYNOPSIS]
sfshearer < in.rsf > out.rsf niter=100 order=10 ref=1. short=1 long=10 rect1=1 rect2=1 ... 
[COMMENTS]
rectN defines the size of the smoothing stencil in N-th dimension.

[PARAMETERS]
int     | long | =10 |   | 	long smoothing radius 
int     | niter | =100 |   | 	number of iterations 
int     | order | =10 |   | 	Hilbert transformer order 
float   | ref | =1. |   | 	Hilbert transformer reference (0.5 < ref <= 1) 
int     | short | =1 |   | 	short smoothing radius 
[DIRECTORY]
user/fomels
