[ccp4bb]: How to display the difference map (Fo-Fc) by Xtalview?

[ccp4er]

Dear colleagues,

I am currently using xtalview and CNS for doing refinement. In order to avoid model bias, I want to difference map (Fo-Fc) instead of 2Fo-Fc map.  First , I generated my map by CNS model_map.inp and then converted it to fsfour map. However, for xtalview, no matter what, I couldn't find any botton that allows me to show the difference map (Fo-Fc).

I am new to protein crystallography. I don't have any colleague or friend who knows protein crystallography. Please help me!

I will highly appreciate your help!

E. S.