[PyMOL] color by partial charge? (electrostatics)

[Mark Wall]

Hello,


Background
   I want to create a surface colored by electrostatic potential in PyMOL.  
   I can simulate this by coloring atoms by a formal charge which is 
   either 1, 0 or -1, ...

   color white
   color blue, (fc; > 0.5)
   color red, (fc; < -0.5)
   show surface

   Of course this does not look like a surface colored by Poisson-Boltzmann 
   calculated potentials

Questions
   1. Can I color atoms by partial_charge? (this did not seem to work for
me)
   2. Is there a better way using only PyMOL to approximate P-B calculated
       potentials?


Thanks,
Mark