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Alter key bindings

It's not GUI, but you could simply bind a function key such as F1 to a command:

cmd.set_key('F1',lambda :cmd.show('sticks'))

Coloring Surface with Electrostatic Potential

You have to load the potential data by Delphi or some other program like AMBER version 9:

load sample.pdb, molecule
load sample.delphi, potential
show surface, molecule
ramp_new level, potential, [-7,0,7]
set surface_color, level, molecule

Van der Waals radii

van der Waals Radii are hard coded in Pymol. They may be obtained for given atoms from:

iterate (name C), print vdw

Default values are:

• C : 1.70
• O : 1.52
• N : 1.55
• H : 1.20
• P : 1.80

and may be changed with the command alter