void multigraph()
{
   gStyle->SetOptFit();
   auto c1 = new TCanvas("c1","multigraph",700,500);
   c1->SetGrid();
   auto *mg = new TMultiGraph();

   const Int_t n = 11;
   Double_t x[]  = {0,1997,3219,3901,3297,2800,2233,1656,1121,802,762};
   Double_t x1[] = {9700,8426,7435,6009,3799,3047,2348,1698,1134,805,765};
   Double_t y[]  = {3,3.5,4,5,8,10,13,18,28,38,40};

   auto g2 = new TGraph(n, x1, y);
   g2->SetPoint(n,x1[n-1],y[0]);

   mg->Add(g2);
   g2->SetFillColor(kGreen-2);

   auto g1 = new TGraph(n, x, y);
   //g1->SetFillColor(kRed-2);
   g1->SetPoint(n,x[0],y[n-1]);
   mg->Add(g1);

   mg->SetTitle("; m^{2}_{12};tan#beta");
   mg->GetXaxis()->CenterTitle(true);
   mg->GetYaxis()->CenterTitle(true);
   mg->Draw("ACF");

   c1->RedrawAxis("G");
   c1->SaveAs("multigraph.pdf");
}