MassCheck.pdf:		mass of all particles compared in different channels (Athena only)
MassAll.pdf:  		mass of all particles (2 leptons + N photons)
MassMinus1.pdf:		mass of all particles - 1 photons (2 leptons + (N-1) photons)
MassMinus2.pdf:		mass of all particles - 2 photons (2 leptons + (N-2) photons)
MassGamma_e+.pdf:	mass of photon + e+
MassGammaGamma_e+.pdf:	mass of two photons + e+