void plot_led_alpha_nim(){

  gROOT->Reset();
  gROOT->SetStyle("Plain");

  gROOT->ForceStyle();

  gStyle->SetOptStat(0);
  gStyle->SetOptFit(0);

  gStyle->SetTitleX(0.1f);
  gStyle->SetTitleW(0.8f);
  gStyle->SetTextSize(1.5);
  
  gStyle->SetTitleFont(132,"xy");
  gStyle->SetLabelFont(132,"xy");

  gStyle->SetLabelSize(0.055,"xy");
  gStyle->SetTitleSize(0.062,"xy");

  gStyle->SetTitleOffset(1.1,"x");
  gStyle->SetTitleOffset(1.0,"y");

  gStyle->SetTitleBorderSize(0);

  gStyle->SetOptFit(11);

  TFile *f1 = new TFile("led.root");
  TFile *f2 = new TFile("alpha.root");

  TH1F *h1  = (TH1F*)f1->Get("Peak1");
  TH1F *h2 = (TH1F*)f2->Get("Peak1");

  TH1F *h11  = (TH1F*)f1->Get("Peak2");
  TH1F *h21 = (TH1F*)f2->Get("Peak2");

  TCanvas *c1 = new TCanvas("c1","c1",200,10, 600, 400);

  gPad->SetBottomMargin(0.15);
  gPad->SetTopMargin(0.05);
  gPad->SetLeftMargin(0.12);
  gPad->SetRightMargin(0.05);

  h1->Rebin(4);
  h2->Rebin(4);

  h1->GetXaxis()->SetRangeUser(0.,4000);
  //  h1->SetMaximum(1600);
  h1->SetMaximum(6000);
  h1->SetTitle("Reference PMT1");

  h1->SetLineWidth(2);
  h1->SetLineColor(2);

  h1->SetTitle("");

  h1->GetXaxis()->SetTitle("ADC count");
  h1->GetYaxis()->SetTitle("Events/ADC count");

  h1->Draw();

  h2->SetLineWidth(2);
  h2->Draw("same");


  //  TLatex *text1 = new TLatex(3000, 1350, "LED");
  TLatex *text1 = new TLatex(3000, 5062, "LED");
  text1 -> SetTextFont(132);
  text1->SetTextSize(0.07);
  text1->SetTextColor(2);
  text1->Draw();

  //  TLatex *text2 = new TLatex(500, 1350, "Alpha");
  TLatex *text2 = new TLatex(400, 5062, "Alpha");
  text2 -> SetTextFont(132);
  text2->SetTextSize(0.07);
  text2->Draw();

  c1->Update();



}