Program sfofpwd | Objective function of dip estimation with PWD filters. 
[SYNOPSIS]
sfofpwd < in.rsf > of.rsf np=100 p0= dp=2*p0/(1.-np) drift=n order=1 nj=1
[PARAMETERS]
float   | dp | =2*p0/(1.-np) |   | 	dip sampling 
bool    | drift | =n |  [y/n] | 	if shift filter 
int     | nj | =1 |   | 	antialiasing 
int     | np | =100 |   | 	number of dips 
int     | order | =1 |  [1,2,3] | 	accuracy order 
float   | p0 | = |   | 	dip origin 
[DIRECTORY]
user/pwd
