Program sfpwd2 | 2-D plane wave destruction. 
[SYNOPSIS]
sfpwd2 < in.rsf dip=dip.rsf > out.rsf order=1 verb=n nj1=1 drift=n
[PARAMETERS]
file    | dip | = |   | 	auxiliary input file name
bool    | drift | =n |  [y/n] | 	if shift filter 
int     | nj1 | =1 |   | 	aliasing 
int     | order | =1 |   | 	accuracy 
bool    | verb | =n |  [y/n] | 	verbosity flag 
[DIRECTORY]
user/yliu
