Program sfpwd1 | One side of plane wave destruction. 
[SYNOPSIS]
sfpwd1 < in.rsf dip=dip.rsf > out.rsf left=y order=1 nj1=1 nj2=1 drift=n
[PARAMETERS]
file    | dip | = |   | 	auxiliary input file name
bool    | drift | =n |  [y/n] | 	if shift filter 
bool    | left | =y |  [y/n] | 	if using left or right side of PWD 
int     | nj1 | =1 |   | 	in-line aliasing 
int     | nj2 | =1 |   | 	cross-line aliasing 
int     | order | =1 |   | 	accuracy 
[DIRECTORY]
user/pwd
