Hi, This is because the HepTuple software assigns a default value for the branch ( "_1", "_2", etc.) when you do not specify one. In order to change it just do _ntuple->column("PMsBranch::PMsCut",phi_cand_mass); Philippe. -----Original Message----- From: owner-roottalk@pcroot.cern.ch [mailto:owner-roottalk@pcroot.cern.ch]On Behalf Of Matthew Martin Sent: Friday, June 08, 2001 9:14 AM To: roottalk@pcroot.cern.ch Subject: [ROOT] ntuple leaf names Hi, Using HepNtuple, when I create an ntuple column with a command like: _ntuple->column("PMsCut",phi_cand_mass); When I look at the resulting root file the leaf is called "_1" and not "PMsCut" .. any idea why? (using version v2_26_00g with KCC_4_0) cheers Mat
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