read_from_file.C

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void read_from_file(){
 
    // Let's open the TFile
    TFile in_file("my_rootfile.root");
 
    // Get the Histogram out
    TH1F* h;
    in_file.GetObject("my_histogram",h);
 
    // Draw it
    auto myCanvas = new TCanvas();
    h->DrawClone();
}