Program sfpwdchain1 | Chain of PWDs - linear operator 
[SYNOPSIS]
sfpwdchain1 < inp.rsf dip=dip.rsf sig=sig.rsf > out.rsf adj=n drift=n forx=n order=1
[PARAMETERS]
bool    | adj | =n |  [y/n] | 	adjoint flag 
file    | dip | = |   | 	auxiliary input file name
bool    | drift | =n |  [y/n] | 	if shift filter 
bool    | forx | =n |  [y/n] | 	for x only 
int     | order | =1 |   | 	PWD order 
file    | sig | = |   | 	auxiliary input file name
[DIRECTORY]
user/pwd
