The 2F0-Fc map was created with Phenix.  I tried the "vop cover #1 atom #0" command but got the following error:

NameError: global name 'step' is not defined

  File "/Applications/Chimera.app/Contents/Resources/share/VolumeFilter/cover.py", line 9, in map_covering_box
    g = volume.grid_data(subregion = 'all', step = step, mask_zone = False)

Hoping to figure out how to make it work.

Many thanks,
---------------------------------
Miriam Gochin
Touro University California / LBL
miriam.gochin@tu.edu
mgochin@lbl.gov
707-638-5463