Dear ROOTers, I'd like to point out that ROOT is being distributed with the definition of /HEPEVT/ corresponding to old Pythia version 5, accomodating for 2000 particles. New Pythia and the present "standard" (-:) definition of /HEPEVT/ defines the particle list in there to be 4000 particles long. After several times of spending an hour on learning this again an again, I think that it makes a lot of sense to have a preprocessor conditional flag in Hepevt.h, such that it would be possible to choose the right dimensions in this interface include file when building the ROOT libraries. best, Pasha
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