I am trying to get an electron density map (.mrc) to overlap with atomic structure (.cif) file of a small organic molecule. When I open my electron density map in ChimeraX, only one rectangle ( i am assuming one lattice piece) appears, which does not encapsulate the entire small molecule. 

I am thinking to use the "vop cover" command to get the density to expand to multiple lattices, but I am not sure what numbers to enter.  When I try "vop cover atomBox #2" (#2 is the ID of the .cif structure), I get a "Missing or invalid 'volumes' argument: invalid density map specifier" response. 

Thanks in advance for any help!!

Megan