[PyMOL] electron density settings

Does anyone know how to alter the isomesh settings?  I'm trying to prepare a figure with pretty electron density and would like to be able to decrease the gap size of the mesh.  I found the variables that seem to make sense like "mesh_quality" and "min_mesh_spacing", but changing these variables doesn't seem to do anything.  "mesh_width" and "mesh_radius" only control the thickness of the mesh lines.

Thanks for the help with the loop radius and variable list.  It was just what I wanted.

- Mark Wilke