How to change scaling factor?
The parameters is in f_user.c file:
1. open the f_user.C with emacs :
R4L-47 litv-exp > emacs -nw f_user.c
2. change the parameters "MWPC_downscale". 
#define MWPC_downscale 0    // reduction = 2**MWPC_downscale                  
3.compile the program.
4. restart mbs.