To center on an object displayed in the graphical display

• Make a selection on the region on which you wish to center on.
• Tools/Center (or use the center button on the right hand-side of the graphical display).

>>electrostatic-potential{display.electrostatic,display.potential,charge} h2-- Electrostatic potential {Electrostatic Potential}

This option generates the skin representation of the molecular surface colored according to the electrostatic potential calculated by the REBEL method (hydrogen atoms are ignored). REBEL is a method to solve the Poisson equation for a molecule. REBEL is a powerful implementation of the boundary element method with analytical molecular surface as dielectric boundary. This method is fast (takes seconds for a protein) and accurate. REBEL stands for Rapid Exact-Boundary ELectrostatics. The energy calculated by this method consists of the Coulomb energy and the solvation energy

In order to color the skin of your molecule by electrostatic potential:

• Select View/Electrostatic potential.
• Enter the potential scale value. This is the local electrostatic potential in kcal/e.u.charge units at which the surface element is colored by extreme red or extreme blue. All higher values will have the same color. This absolute scaling is convenient to develop a feeling of electrostatic properties of molecular surfaces.
• Areas colored blue represent positive areas and red represents negative areas.