# Examples of a Graph with error bars

    {
       //
       // To see the output of this macro, click  here.
       //
       gROOT->Reset();
       c1 = new TCanvas("c1","A Simple Graph with error bars",200,10,700,500);

       c1->SetFillColor(42);
       c1->SetGrid();
       c1->GetFrame()->SetFillColor(21);
       c1->GetFrame()->SetBorderSize(12);

       Int_t n = 10;
       Float_t x[n]  = {-0.22, 0.05, 0.25, 0.35, 0.5, 0.61,0.7,0.85,0.89,0.95};
       Float_t y[n]  = {1,2.9,5.6,7.4,9,9.6,8.7,6.3,4.5,1};
       Float_t ex[n] = {.05,.1,.07,.07,.04,.05,.06,.07,.08,.05};
       Float_t ey[n] = {.8,.7,.6,.5,.4,.4,.5,.6,.7,.8};
       gr = new TGraphErrors(n,x,y,ex,ey);
       gr->SetTitle("TGraphErrors Example");
       gr->SetMarkerColor(4);
       gr->SetMarkerStyle(21);
       gr->Draw("ALP");

       c1->Update();
    }