void dif()
{

    TFile *f1 = TFile::Open("out2.root");
    TH1F *h1= (TH1F*)f1->Get("PosX_130primary");
    h1->SetLineWidth(3);
    h1->SetLineColor(5);
    h1->SetMinimum(0.001);
    h1->SetMaximum(10);
    h1->Rebin(100);


    TFile *f2 = TFile::Open("out1.root");
    TH1F *h2 = (TH1F*)f2->Get("PosX_130primary");
    h2->SetLineWidth(2);
    h2->SetLineColor(7);
    h2->SetMinimum(0.001);
    h2->SetMaximum(10);
    h2->Rebin(100);

        TH1D *ang = new TH1D("ang","hist", 1, -0.8, 0.8);
             ang->Add(h1, h2, -1.0, 1.0);
             ang->Draw("");
    

}