Program sfvelmod | Velocity transform.
[SYNOPSIS]
sfvelmod < scan.rsf > cmp.rsf half=y extend=4 slowness=n
[COMMENTS]

Inverse of sfvscan.

[PARAMETERS]
int     | extend | =4 |   | 	trace extension 
bool    | half | =y |  [y/n] | 	if y, the second axis is half-offset instead of full offset 
bool    | slowness | =n |  [y/n] | 	if y, use slowness instead of velocity 
[DIRECTORY]
system/seismic
