Normalize ccp4 maps
This setting controls whether or not PyMOL normalizes the values in a ccp4 map 'upon loading. So, if your values are off, unset this option before loading your map.
You might need this setting if, when you load maps in other programs (eg. Coot, O) they map properly covers all atoms, but in PyMOL the map does not.
# turn it on set normalize_ccp4_maps # turn it off (stop the normalizing) unset normalize_ccp4_maps