[ccp4bb] Phases from MR+SAD

[kumar]

Dear members, 
I am trying to refine phases (using Refmac) from SAD+MR recombination (from
Phaser).  Since the SAD phases are tainted with MR model bias, I am not sure
if those phases (of MR+SAD) should be used for refinement. Can any one
explain this? 
Thank you.  
Kumar