Hello, In my code I read a ntuple and do the following to write all histograms (objects); TDirectory *dir = gDirectory; TFile *f = new TFile("file.root","recreate"); dir->GetList()->Write(); delete f; The file.root contain all histograms but he contain also the ntuple that I read... I don't want to save the ntuple in the file. Writing histogram one by one works but do you have another solution. Martin
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