CHELPG in GAMESS



Dear All,
 I am trying to use CHELPG in GAMESS to get electrostatic potential. In the
 GAMESS doc., it is written:
 "CHELPG: to use a modified version of the CHELPG algorithm, which produces
 a
 symmetric grid of points for a symmetric molecule"
 - Does it mean that the CHELPG algorithm in GAMESS is different from the
 published one in Breneman & Wiberg, J Comput Chem 1990, 11, 361-373 ?
 - If yes, why this algo. has been modified in GAMESS and/or is there a way to
 use
 the original one in GAMESS ?
 Thanks, regards, Francois