Hey Rooters, My problem is that my histrograms keep disappearing from memory. Here is what I am doing. I have an row-wise Ntuple from HBook that I have converted with h2root. The ntuple is called h666. So I open the file, make the histogram, then I want to clode the Ntuple and open another one and add to it. But as soon as I close the file, I lose the histogram. How can I get around this. Sample code f1 = new TFile("ntup1"); MOM = new TH1F(bins); h666->Draw("mom>>+MOM", "cuts"); delete f1 //This is were I lose my histogram f1 = new TFile("ntup2"); MOM = new TH1F(bins); h666->Draw("mom>>+MOM", "cuts"); etc..... What am I doing wrong. Jeff Patterson
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