{
   auto *c = new TCanvas();
   c->Divide(2,1);

   auto *g1 = new TGraphErrors();
   g1->SetPoint(0,-4,-3);
   g1->SetPoint(1,1,1);
   g1->SetPoint(2,2,1);
   g1->SetPoint(3,3,4);
   g1->SetPoint(4,5,5);
   g1->SetPointError(0,1.,2.);
   g1->SetPointError(1,2,1);
   g1->SetPointError(2,2,3);
   g1->SetPointError(3,3,2);
   g1->SetPointError(4,4,5);
   g1->SetMarkerStyle(21);

   auto *g2 = new TGraph();
   g2->SetPoint(0,4,8);
   g2->SetPoint(1,5,9);
   g2->SetPoint(2,6,10);
   g2->SetPoint(3,10,11);
   g2->SetPoint(4,15,12);
   g2->SetLineColor(kRed);
   g2->SetLineWidth(5);

   auto mg = new TMultiGraph();
   mg->Add(g1,"P");
   mg->Add(g2,"L");

   c->cd(1); gPad->SetGrid(1,1);
   mg->Draw("A");

   c->cd(2); gPad->SetGrid(1,1);
   mg->Draw("A RX RY");
}