Program sfslopescan | slope estimation by stack scan 
[SYNOPSIS]
sfslopescan < in.rsf > out.rsf nw=5 rect1=2 rect2=2
[PARAMETERS]
int     | nw | =5 |   | 	window size is 2*nw+1 
int     | rect1 | =2 |   | 	window size on the 1st dimension 
int     | rect2 | =2 |   | 	window size on the 2nd dimension 
[DIRECTORY]
user/chen
