You need to run mapmask to extend the mask to cover an assymetric unit
using the overlap option. CCP4i instruction here:
http://ccp4wiki.org/~ccp4wiki/wiki/index.php?title=Electron_density_manipulation#Converting_a_non-crystallographic_mask_to_a_crystallographic_mask
This is becoming a very FAQ. I
Hello all
I've made a mask by MAMA from a PDB file. I also used command "Atom_fit" to
check that all of the atoms were covered by the mask.
But after converting the mask to ccp4 format and opening in COOT, the mask was
too small, only covered half of the model. The mask was cut along two axis.
