Hi all, in fact there is a bug concerning the writing of vector<string> in TFile. See the example : filealreadysummarized->toto.push_back(1); filealreadysummarized->toto.push_back(2); filealreadysummarized->toto.push_back(3); filealreadysummarized->tutu.push_back("x"); filealreadysummarized->tutu.push_back("y"); filealreadysummarized->tutu.push_back("z"); toto is a vector<int> and tutu is a vector<string>. Then they are stored in a Root file. After reading the rootfile the content is : 1 2 3 x x x The same string has been written 3 times. It looks like a bug, no ? Bye, Cyril
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