class PStdData: public TObject

  Pluto Particle Data (The standard version)

  This class contains a permanent data base of particles
  and their properties, functions to load additional
  temporary particles and decay modes, as well as functions
  to build decay widths and branching ratios and sample masses
  of arbitrary hadronic resonances.
  The PID convention is consistent with GEANT, with up to
  999 particles supported.

                             Author:  M.A. Kagarlis
                             Written: 31/01/99
                             Revised: 24/05/2004 R.H.
                             Revised particle tables: 09/06/2004 R.H.
                             Bug fixes: 13/10/2004 R.H.
                             mu+mu-: 02/02/2005 R.H.
                             N1535: 25/01/2007 R.H.

 The static arrays habe been copied from the original PData class
 to a "filler" to have more flexibility (IF 28.4.2007)

 Ref 1: Particle Data Group, Review of Particle Properties,
        Phys. Rev. D54 (1996) 1 (and earlier editions)