[PyMOL] Contouring isomesh to absolute values

Is it currently possible to contour map representations (i.e. isomesh) by absolute values (electrons per cubic angstroms) rather than by the map's sigma value? For example, this is useful when making figures comparing maps from two different structures.

Sincerely,
Justin T. Biel
Graduate Student
University of California San Francisco
Integrative Program in Quantitative Biology
Jus...@uc...