{
auto c0 = new TCanvas("c1","multigraph L3",200,10,700,500);

auto mg = new TMultiGraph();

auto gr1 = new TGraph(); gr1->SetLineColor(kBlue);
auto gr2 = new TGraph(); gr2->SetLineColor(kRed);
auto gr3 = new TGraph(); gr3->SetLineColor(kGreen);
auto gr4 = new TGraph(); gr4->SetLineColor(kOrange);

Double_t dx = 6.28/1000;
Double_t x  = -3.14;

for (int i=0; i<=1000; i++) {
    x = x+dx;
    gr1->SetPoint(i,x,2.*TMath::Sin(x));
    gr2->SetPoint(i,x,TMath::Cos(x));
    gr3->SetPoint(i,x,TMath::Cos(x*x));
    gr4->SetPoint(i,x,TMath::Cos(x*x*x));
    }

    mg->Add(gr4); gr4->SetTitle("Cos(x*x*x)"); gr4->SetLineWidth(3);
    mg->Add(gr3); gr3->SetTitle("Cos(x*x)")  ; gr3->SetLineWidth(3);
    mg->Add(gr2); gr2->SetTitle("Cos(x)")    ; gr2->SetLineWidth(3);
    mg->Add(gr1); gr1->SetTitle("2*Sin(x)")  ; gr1->SetLineWidth(3);

    mg->SetTitle("Multi-graph Title; X-axis Title; Y-axis Title");

    mg->Draw("a fb l pads3");

    mg->GetHistogram()->GetXaxis()->SetRangeUser(0.,2.5);
    gPad->Modified();
    gPad->Update();
}