[PyMOL] apbs color ligand by potential using pml script

HI everyone
I have been able to show electrostatics from APBS by loading the .dx map
using a pml script. However, I would really like to display it on the
surface similar to the apbs plugin option which says "color by potential
on solvent accessible surface" in the visualization menu. Does anyone
know how to do this using a pml script?
Actually, when I use this the potentials on the surface look a lot
smoother. I was also wondering, which representation is best.
Thanks
MIke
--=20
Mike Osborne
Universit=C3=A9 de Montr=C3=A9al
Montreal, Quebec, H3T 1J4