Hi, I am opening a TFile root [0] TFile f1("data.00.1.root"); which is converted from an hbook file containing one ntuple with ID 1. For some reason (for which I find no reason in my fortran/hbook code) have two keys in the root file: root[1] f1.ls() TFile** data.00.1.root HBOOK file: data.00.1.ntp converted to ROOT TFile* data.00.1.root HBOOK file: data.00.1.ntp converted to ROOT KEY: TTree h1;2 ORANGE KEY: TTree h1;1 ORANGE Now I have several files or rather ntuples which I want to chain - no problem in paw with the hmerge command. But in root the TChain fails maybe because some of the fails only have one KEY: TTree entry: TFile** data.00.3.root HBOOK file: data.00.3.ntp converted to ROOT TFile* data.00.3.root HBOOK file: data.00.3.ntp converted to ROOT KEY: TTree h1;1 ORANGE Any suggestion what I might do? I was thinking about saving one of the versions (I understand the h1;1 and h1;2 stand for different versions?) to a new file ... but I had some difficulty in doing so ... Can anybody help? Cheers, and thanks, Thomas
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