I can follow the tutorials/examples and create a scatterplot as so. TFile *f = new TFile("070299.root"); // contains the TTree cains // with branchs NE, Time cains->Draw("NE:Time>>cains_plt","(NE > -500) && (NE < 500)"); This gives me the correct plot of NE variable plotted against time. But then I try to use the resulting TH2F cains_plt, by doing cains_plt->Draw(); and I don't get the same plot. Why? Can I set an option or something to get the original scatterplot? I can get around this by doing TGraph *neplt = new TGraph(cains->GetSelectedRows(), cains->GetV2(), cains->GetV1()); but TGraph doesn't seem to have as many options as using TH2F. -- Christopher A. Stevens Navigation/Data Reduction Voice (301) 342-3181 x263 Fax (301) 342-4745
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