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