{
    TFile *fin = new TFile("example_data.root");
    TNtupleD* nt = (TNtupleD *)fin->Get("nt");
    
    RooRealVar mass("mass","mass",0.,2.);
    RooDataSet data("data","data",nt,RooArgSet(mass));
    data.Print("v");
    
    TH1D* hist = (TH1D *)fin->Get("hist");
    RooDataHist bindata("bindata","bindata",RooArgList(mass),hist);
    bindata.Print("v");
    
    mass.setBins(50);
    RooDataHist bindata2("bindata2","bindata2",RooArgList(mass),data);
    bindata2.Print("v");
}