Electrostatic Potential Maps



 I would appreciate any suggestions on programs which can
 calculate and display the difference in the electrostatic potential
 maps between two molecules.  For example, given the electrostatic
 potential map for benzene and the ESP map for pyridine, return
 a map which shows the difference in the region of the pyridine
 nitrogen atom.  The molecules are superimposed before their maps are
 generated and the ESP maps are either on the solvent-accessible
 surface or at a given electron density.  It would be useful if the
 program could work with output from Gaussian and/or MOPAC.
     Thanks in advance for any suggestions!
                                 Joe Eyermann
                                 DuPont Merck Pharmaceuticals
 																																eyermacj()at()lldmpc.dnet.dupont.com
 																																note that the letter 'l'
 																																in the address NOT number 1