[ccp4bb] Unit of electrostatic potential in PyMol

[Parthasarathy Sampathkumar]

Dear All,

I used PyMol to generate a qualitative Vacum Electrostatic surface (without
APBS calculations).
Positve and negative potentials are displayed in the range 56.3 to -56.3.
What is the units of these numbers?

Thank you,
-Partha