void Pixels(int ip=10) {
  gROOT->SetStyle("Plain");

  TCanvas *c1=new TCanvas("c1","Canvas",600,600);
  //c1->SetLogy();
  
  gStyle->SetOptStat(0);

  if(ip==10) {
    TFile::Open("SimAnalysisLayerTracks900071.root");
    SLayer3All->SetTitle("Photon 10GeV;Number of particles;Number of hit pixels");
  }
  if(ip==100) {
    TFile::Open("SimAnalysisLayerTracks900045.root");
    SLayer3All->SetTitle("Photon 100GeV;Number of particles;Number of hit pixels");
  }
  if(ip==1000) {
    TFile::Open("SimAnalysisLayerTracks900058.root");
    SLayer3All->SetTitle("Photon 1TeV;Number of particles;Number of hit pixels");
  }

  TLatex t;
  t.SetTextAlign(31);
  t.SetTextSize(0.04);

  SLayer0All->SetMarkerStyle(20);
  SLayer0All->SetMarkerSize(0.1);
  SLayer0All->SetMarkerColor(5);

  SLayer1All->SetMarkerStyle(20);
  SLayer1All->SetMarkerSize(0.1);
  SLayer1All->SetMarkerColor(4);

  SLayer2All->SetMarkerStyle(20);
  SLayer2All->SetMarkerSize(0.1);
  SLayer2All->SetMarkerColor(2);

  SLayer3All->SetMarkerStyle(20);
  SLayer3All->SetMarkerSize(0.1);
  SLayer3All->SetMarkerColor(3);

  if(ip==10) {
    SLayer3All->GetXaxis()->SetRangeUser(0,160);
    SLayer3All->GetYaxis()->SetRangeUser(0,160);
  }
  if(ip==100) {
    SLayer3All->GetXaxis()->SetRangeUser(0,800);
    SLayer3All->GetYaxis()->SetRangeUser(0,800);
  }
  if(ip==1000) {
    SLayer3All->GetXaxis()->SetRangeUser(0,6000);
    SLayer3All->GetYaxis()->SetRangeUser(0,6000);
  }
  SLayer3All->GetYaxis()->SetTitleOffset(1.3);

  SLayer3All->Draw();
  SLayer2All->Draw("same");
  SLayer1All->Draw("same");
  SLayer0All->Draw("same");

  if(ip==10) {
    t.DrawLatex( 45,140,"Pixel size:");
    t.SetTextColor(5);
    t.DrawLatex( 70,140," 25mu");
    t.SetTextColor(4);
    t.DrawLatex( 70,130," 50mu");
    t.SetTextColor(2);
    t.DrawLatex( 70,120,"100mu");
    t.SetTextColor(3);
    t.DrawLatex( 70,110,"200mu");
  }
  if(ip==100) {
    t.DrawLatex(225,700,"Pixel size:");
    t.SetTextColor(5);
    t.DrawLatex(350,700," 25mu");
    t.SetTextColor(4);
    t.DrawLatex(350,650," 50mu");
    t.SetTextColor(2);
    t.DrawLatex(350,600,"100mu");
    t.SetTextColor(3);
    t.DrawLatex(350,550,"200mu");
  }
  if(ip==1000) {
    t.DrawLatex(1600,5000,"Pixel size:");
    t.SetTextColor(5);
    t.DrawLatex(2600,5000," 25mu");
    t.SetTextColor(4);
    t.DrawLatex(2600,4700," 50mu");
    t.SetTextColor(2);
    t.DrawLatex(2600,4400,"100mu");
    t.SetTextColor(3);
    t.DrawLatex(2600,4100,"200mu");
  }

  c1->Update();
  if(ip==  10) c1->Print("Pixels10.png");
  if(ip== 100) c1->Print("Pixels100.png");
  if(ip==1000) c1->Print("Pixels1000.png");
}