void plot_ccal_time(){
  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->SetLabelFont(62,"xy");

  //  gStyle->SetLabelSize(0.073,"xy");
  //  gStyle->SetTitleSize(0.086,"xy");

  gStyle->SetLabelSize(0.055,"xy");
  gStyle->SetTitleSize(0.065,"xy");

  gStyle->SetTitleOffset(1.0,"x");
  gStyle->SetTitleOffset(0.8,"y");

  gStyle->SetOptLogy();

  TFile *f = new TFile("test.root");
  TH1F *fcal_beam_tagh = (TH1F*)f->Get("fcal_beam_tagh");

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

  //  c1->Divide(1, 2, 0.006, 0.006);

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

  //  sipm23->GetXaxis()->SetNdivisions(508);
  //  sipm23->SetMaximum(35);
  //  sipm23->SetMarkerStyle(20);
  //  sipm23->SetMarkerSize(0.7);
  //  sipm23->SetMarkerColor(4);

  fcal_beam_tagh->GetXaxis()->SetRangeUser(-10.,10.);

  fcal_beam_tagh->SetMinimum(8);

  fcal_beam_tagh->SetLineColor(1);
  fcal_beam_tagh->SetLineWidth(2);
  
  fcal_beam_tagh->GetXaxis()->SetTitle("T_{BEAM} - T_{CCAL}   (ns)");
  fcal_beam_tagh->GetYaxis()->SetTitle("Events / 0.1 ns");
  fcal_beam_tagh->SetTitle("");

  fcal_beam_tagh->Draw("histo");

  //  fcal_beam_tagh->Draw("e0");

  //  TLatex *text1 = new TLatex(850, 28, "(a)");
  //  text1 -> SetTextFont(132);
  //  text1->SetTextSize(0.12);
  //  text1->Draw();


}