Program sfdivn2d | 2D divn 
[SYNOPSIS]
sfdivn2d < inp.rsf den=den.rsf > out.rsf rect1=1 rect2=1 niter=100 verb=n
[PARAMETERS]
file    | den | = |   | 	auxiliary input file name
int     | niter | =100 |   | 	number of iterations 
int     | rect1 | =1 |   | 	
int     | rect2 | =1 |   | 	smoothing radius 
bool    | verb | =n |  [y/n] | 	verbosity 
[DIRECTORY]
user/chen
