[ROOT] CloneTree fills one branch with zeros

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Hi,

I have a problem using CloneTree. It clones all the branches of my tree 
except one. This one is instead filled with zeros:

root [0] TFile f("xsignal.root")
root [1] TTree *xtree = (TTree *)f.Get("xtree")
root [2] TTree *tree = xtree->CloneTree(10)
root [3] xtree.Scan("runnumber:m0pi0:m0rhoc")
************************************************
*    Row   * runnumber *     m0pi0 *    m0rhoc *
************************************************
*        0 *    920010 * 0.1351703 * 0.8215906 *
*        1 *    920010 * 0.1402094 * 0.8085310 *
*        2 *    920010 * 0.1351703 * 0.7278476 *
*        3 *    920010 * 0.1402094 * 0.7103212 *
*        4 *    920010 * 0.1351703 * 0.4107116 *
*        5 *    920010 * 0.1402094 * 0.4091337 *
*        6 *    920010 * 0.1351703 * 0.4188330 *
*        7 *    920010 * 0.1351703 * 0.9753960 *
*        8 *    920010 * 0.1402094 * 0.9261648 *
*        9 *    920010 * 0.1351703 * 0.9753960 *
*       10 *    920010 * 0.1402094 * 0.9261648 *
[...]
Type <CR> to continue or q to quit ==> q
************************************************
(Int_t)25
root [4] tree.Scan("runnumber:m0pi0:m0rhoc") 
************************************************
*    Row   * runnumber *     m0pi0 *    m0rhoc *
************************************************
*        0 *    920010 * 0.1351703 *         0 *
*        1 *    920010 * 0.1402094 *         0 *
*        2 *    920010 * 0.1351703 *         0 *
*        3 *    920010 * 0.1402094 *         0 *
*        4 *    920010 * 0.1351703 *         0 *
*        5 *    920010 * 0.1402094 *         0 *
*        6 *    920010 * 0.1351703 *         0 *
*        7 *    920010 * 0.1351703 *         0 *
*        8 *    920010 * 0.1402094 *         0 *
*        9 *    920010 * 0.1351703 *         0 *
************************************************
(Int_t)10


The same happens when I use SetBranchStatus("*",1) before and after 
CloneTree. Also the same problem occurs when I use CopyTree.

Does anybody have an idea what I am doing wrong? I am using RooT 3.10-01.

Thanks,
Frank

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