{
  bool drawMultiGraphs = false;
  Int_t rangeFunc = 1; // 1 - SetLimits, 2  - SetRange, 3 - SetUserRange
  
  const Int_t N1 = 10;
  const Int_t N2 = 6;
  Int_t NMax, in;
  Float_t x1[N1], x2[N2], y1[N1], y2[N2], step, dir;

  y1[0] = 5.0;
  y2[0] = 0.1;
  step  = 0.5;
  x1[0]  = 0.0;
  x2[0]  = 1.5;

  dir = 1.0;
  cout<<"Graph1:\n";
  for (in=1; in<N1; in++) {
    if (in>N1/2) dir = -1.0;
    x1[in]  = (Float_t) in;
    y1[in] = y1[in-1]+(2.0*step*dir);
    cout<<"("<<x1[in]<<", "<<y1[in]<<")\n";
  }
  dir = 1.0;
  cout<<"Graph2:\n";
  for (in=1; in<N2; in++) {
    if (in<N2/2) dir = -1.0;
    else dir = 1.0;
    x2[in]   = in+1.5;
    y2[in]   = y2[in-1]+(-0.1*step*dir); 
    cout<<"("<<x2[in]<<", "<<y2[in]<<")\n";
  }

  TGraph *inputSpec  = new TGraph(N1, x1, y1);
  TGraph *inputSpec2 = new TGraph(N2, x2, y2);
  TMultiGraph *mg  = new TMultiGraph();
  TMultiGraph *mg2 = new TMultiGraph();

  TH1F *h1 = inputSpec->GetHistogram();
  h1->Scale(0.1);
  h1->SetXTitle("X title");
  h1->SetYTitle("Y title");

  TCanvas *c1 = new TCanvas("c1", "Intensity of LED 1",0,  0, 800, 600);
  TPad *pad1 = new TPad("pad1","",0,0,1,1);
  TPad *pad2 = new TPad("pad2","",0,0,1,1);
  pad2->SetFillStyle(4000);
  // Makes pad2
  pad2->SetFrameFillStyle(0);
  // transparent.
  pad1->Draw();
  pad1->cd();

  inputSpec->SetMarkerStyle(29);
  inputSpec->SetMarkerColor(kBlack+2);
  inputSpec->SetLineColor(kBlack);
  mg->Add(inputSpec,"LP");
  if (drawMultiGraphs) {
    mg->Draw("ALP");
    //    mg->GetXaxis()->SetLimits(0.,9.);
    switch (rangeFunc) {
    case 1: mg->GetXaxis()->SetLimits(0.,9.); break;
    case 2: mg->GetXaxis()->SetRange(0.,9.); break;
    case 3: mg->GetXaxis()->SetRangeUser(0.,9.); break;
    }
    mg->GetXaxis()->SetRangeUser(0.,9.);
    pad1->Update();
  }
  else {
    //    inputSpec->GetXaxis()->SetLimits(0.,9.);
    switch (rangeFunc) {
    case 1: inputSpec->GetXaxis()->SetLimits(0.,9.); break;
    case 2: inputSpec->GetXaxis()->SetRange(0.,9.); break;
    case 3: inputSpec->GetXaxis()->SetRangeUser(0.,9.); break;
    }
    inputSpec->Draw("ALP");
  }

  TH1F *h2 = inputSpec2->GetHistogram();
  TAxis *Ay2 = h2->GetYaxis();
  Ay2->SetRangeUser(0.0, 0.5);

  pad2->Draw();
  pad2->cd();

  inputSpec2->SetMarkerStyle(29);
  inputSpec2->SetMarkerColor(kRed+2);
  inputSpec2->SetLineColor(kRed);
  mg2->Add(inputSpec2,"LPY+");
  if (drawMultiGraphs) {
    mg2->Draw("LPAY+");
    switch (rangeFunc) {
    case 1: mg2->GetXaxis()->SetLimits(0.,9.); break;
    case 2: mg2->GetXaxis()->SetRange(0.,9.); break;
    case 3: mg2->GetXaxis()->SetRangeUser(0.,9.); break;
    }
    mg2->GetXaxis()->SetAxisColor(kRed);
    mg2->GetXaxis()->SetLabelColor(kRed);  
    mg2->GetYaxis()->SetAxisColor(kRed);
    mg2->GetYaxis()->SetLabelColor(kRed);  
    pad2->Update();
  }
  else {
    switch (rangeFunc) {
    case 1: inputSpec2->GetXaxis()->SetLimits(0.,9.); break;
    case 2: inputSpec2->GetXaxis()->SetRange(0.,9.); break;
    case 3: inputSpec2->GetXaxis()->SetRangeUser(0.,9.); break;
    }
    inputSpec2->GetXaxis()->SetAxisColor(kRed);
    inputSpec2->GetXaxis()->SetLabelColor(kRed);  
    inputSpec2->GetYaxis()->SetAxisColor(kRed);
    inputSpec2->GetYaxis()->SetLabelColor(kRed);  
    inputSpec2->Draw("LPAY+");
  }
}