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Track ID: Indexes every hit in the matrix in track-based groups. Simulated noise from cluster hits are listed as one Track ID, random noise hits have a single Track ID, partial tracks have a single Track ID, track fragments have a single Track ID, simulated tripped DC noise has a single Track ID. Should range from 0-999.
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Process ID: cluster hit ID, DC trip ID, random noise ID, DY ID, J/psi ID, psi' ID, pi0, kaon, ...
track-index:1-999
vertexflag: 1=target, 2=dump, 3=gap
process-id: 11=DY(mu+), 12=J/psi(mu+), 13=psi'(mu+), 14=single (mu+),21=DY(mu-), 22=J/psi(mu-), 23=psi'(mu-), 24=single (mu-).