> but I am sure this is just a case of not understanding C++ scope rules > since I can view histograms with a TBrowser during the session but > not in a new root session. Hi Karl, I tried your macro with root 3.01.06 and 3.02.02 and found that it did produce a file test.root that contains a dozen of histogram in the top directory and another 40 histogram in the Raw_Ge subdirectory. I was able to access them all in a new root session. Could you be more specific in what actually failed? Cheers, Philippe.
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