Adding two histogram

ROOT
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How to add two histogram from the file “/storage/local/home/atlas/analysis/submitDir_sig/hist-signal.root”

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TFile *myfile   = TFile::Open("/storage/local/home/atlas/analysis/submitDir_sig/hist-signal.root",“READ”);
TH1F  *myhist_1 = (TH1F* )myfile->Get(“electron_Pt”);
TH1F  *myhist_2 = (TH1F* )myfile->Get(“muon_Pt”);
myhist_1->Add("myhist_2")
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