Hello Marian, Welcome to ROOT! It's really great stuff. I think what you are looking for is the TTree class. This data structure can be used to house an enormous amount of data. So, I would begin by looking at that, and some of the example for using TTree and TFile for I/O. You might also find TH2F of interest for visualizing your data in 2D histograms. There are alot of good examples on how to use these structures in the tutorial section on the root home page. If you get stuck anywhere.. just ask here. Rene and Fonz just love the attention. (*ducks*). Brandon Kohn +377 97 97 41 51 ext. 306 (Work) +377 97 77 86 71 (Home) blk@maia-institute.org The Maia Institute, Monaco
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