void exclusiongraphlegend() {
    TCanvas *c1 = new TCanvas("c1","Exclusion graphs examples",200,10,600,400);

    const Int_t n = 35;
    Double_t xvalues[n], yvalues[n];
    for (Int_t i=0;i<n;i++) {
      xvalues[i]  = i*0.1;
      yvalues[i] = 10*cos(xvalues[i]);
    }

    TGraph *gr = new TGraph(n,xvalues,yvalues);
    gr->SetLineColor(4);
    gr->SetLineWidth(-2002);
    gr->SetFillStyle(3004);
    gr->SetFillColor(9);
    gr->SetTitle("");
    gr->Draw("AC");

    TLegend *leg = new TLegend(0.7,0.8,0.9,0.9);
    leg->SetFillColor(0);
    leg->SetBorderSize(0);
    leg->SetTextSize(0.05);
    leg->SetTextFont(42);

    leg->AddEntry(gr,"exclusion","lf");
    leg->Draw();
}