dear roottalk-members, i haven't done a lot with ntuples yet, but now i have to use cbnt (combined physics ntuple) to make my analysis. as the combined physics ntuple has various branches with different numbers of filled objects (classified by indices like Ntravt, Ntrack, Npar, ...), i can't just for instance look over nevnt (Tree -> GetEntries()) and calculate values like (phi_generated - phi_reconstructed), when phi_generated is numbered by an index called pgen and phi_reconstructed by an inces called ntrackr. does anyone know how i could relate them (declaring an Event?). This would help me a lot. Thanks, Andi
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