[ccp4bb] on the electron microscopy function of refmac5

[Smith Liu]

Dear All,
 
The CCP4 document says refmac can process electron microscopy map for 
refinement. But I cannot localize that function in the refmac5 of the CCP4.
 
Will you please advise how to have the refmac process the electron microscopy 
map?
 
Smith