void fit_waveform03(void)
{
//=========Macro generated from canvas: c1/c1
//=========  (Wed Dec 17 14:48:35 2014) by ROOT version5.34/19
   TCanvas *c1 = new TCanvas("c1", "c1",1505,246,779,672);

gROOT->Reset();
//TTree *Bfield = (TTree *) gROOT->FindObject("Bfield");
gStyle->SetPalette(1,0);
gStyle->SetOptStat(kTRUE);
gStyle->SetOptFit(kTRUE);
gStyle->SetOptFit(1111);
gStyle->SetPadRightMargin(0.15);
gStyle->SetPadLeftMargin(0.15);
gStyle->SetPadBottomMargin(0.15);
gStyle->SetFillColor(0);
//

   c1->Range(-21.79487,-16.8,106.4103,95.2);
   c1->SetFillColor(0);
   c1->SetBorderMode(0);
   c1->SetBorderSize(2);
   c1->SetLeftMargin(0.17);
   c1->SetRightMargin(0.05);
   c1->SetBottomMargin(0.15);
   c1->SetFrameBorderMode(0);
   c1->SetFrameBorderMode(0);
   
   TH1F *hist03 = new TH1F("hist03","Ch=38,10,13",100,0,100);
   hist03->SetBinContent(1,2);
   hist03->SetBinContent(2,3);
   hist03->SetBinContent(3,3);
   hist03->SetBinContent(4,2);
   hist03->SetBinContent(5,1);
   hist03->SetBinContent(6,2);
   hist03->SetBinContent(7,3);
   hist03->SetBinContent(8,3);
   hist03->SetBinContent(9,1);
   hist03->SetBinContent(10,4);
   hist03->SetBinContent(11,1);
   hist03->SetBinContent(12,1);
   hist03->SetBinContent(13,3);
   hist03->SetBinContent(14,3);
   hist03->SetBinContent(15,1);
   hist03->SetBinContent(16,2);
   hist03->SetBinContent(17,1);
   hist03->SetBinContent(18,2);
   hist03->SetBinContent(19,1);
   hist03->SetBinContent(20,2);
   hist03->SetBinContent(22,3);
   hist03->SetBinContent(23,2);
   hist03->SetBinContent(24,3);
   hist03->SetBinContent(25,3);
   hist03->SetBinContent(26,3);
   hist03->SetBinContent(27,3);
   hist03->SetBinContent(28,1);
   hist03->SetBinContent(29,1);
   hist03->SetBinContent(30,3);
   hist03->SetBinContent(31,3);
   hist03->SetBinContent(32,3);
   hist03->SetBinContent(33,5);
   hist03->SetBinContent(34,3);
   hist03->SetBinContent(35,5);
   hist03->SetBinContent(36,30);
   hist03->SetBinContent(37,61);
   hist03->SetBinContent(38,71);
   hist03->SetBinContent(39,71);
   hist03->SetBinContent(40,68);
   hist03->SetBinContent(41,65);
   hist03->SetBinContent(42,59);
   hist03->SetBinContent(43,53);
   hist03->SetBinContent(44,49);
   hist03->SetBinContent(45,50);
   hist03->SetBinContent(46,44);
   hist03->SetBinContent(47,41);
   hist03->SetBinContent(48,41);
   hist03->SetBinContent(49,34);
   hist03->SetBinContent(50,32);
   hist03->SetBinContent(51,28);
   hist03->SetBinContent(52,27);
   hist03->SetBinContent(53,23);
   hist03->SetBinContent(54,25);
   hist03->SetBinContent(55,22);
   hist03->SetBinContent(56,21);
   hist03->SetBinContent(57,21);
   hist03->SetBinContent(58,18);
   hist03->SetBinContent(59,19);
   hist03->SetBinContent(60,20);
   hist03->SetBinContent(61,17);
   hist03->SetBinContent(62,15);
   hist03->SetBinContent(63,15);
   hist03->SetBinContent(64,15);
   hist03->SetBinContent(65,12);
   hist03->SetBinContent(66,12);
   hist03->SetBinContent(67,14);
   hist03->SetBinContent(68,12);
   hist03->SetBinContent(69,12);
   hist03->SetBinContent(70,10);
   hist03->SetBinContent(71,8);
   hist03->SetBinContent(72,6);
   hist03->SetBinContent(73,8);
   hist03->SetBinContent(74,7);
   hist03->SetBinContent(75,4);
   hist03->SetBinContent(76,6);
   hist03->SetBinContent(77,7);
   hist03->SetBinContent(78,4);
   hist03->SetBinContent(79,6);
   hist03->SetBinContent(80,4);
   hist03->SetBinContent(81,5);
   hist03->SetBinContent(82,3);
   hist03->SetBinContent(83,1);
   hist03->SetBinContent(84,2);
   hist03->SetBinContent(85,2);
   hist03->SetBinContent(86,2);
   hist03->SetBinContent(87,3);
   hist03->SetBinContent(88,3);
   hist03->SetBinContent(90,3);
   hist03->SetBinContent(91,3);
   hist03->SetBinContent(92,4);
   hist03->SetBinContent(93,2);
   hist03->SetBinContent(94,3);
   hist03->SetBinContent(95,4);
   hist03->SetBinContent(96,4);
   hist03->SetBinContent(97,4);
   hist03->SetBinContent(98,4);
   hist03->SetBinContent(99,5);
   hist03->SetBinContent(100,5);
   hist03->SetMaximum(84);
   hist03->SetEntries(1100);
   // hist03->SetStats(0);
   hist03->SetLineColor(2);
   hist03->GetXaxis()->SetTitle("sample   (4 ns)");
   hist03->GetXaxis()->SetNdivisions(505);
   hist03->GetXaxis()->SetLabelFont(42);
   hist03->GetXaxis()->SetLabelSize(0.07);
   hist03->GetXaxis()->SetTitleSize(0.07);
   hist03->GetXaxis()->SetTitleFont(42);
   hist03->GetYaxis()->SetTitle("ADC value");
   hist03->GetYaxis()->SetNdivisions(505);
   hist03->GetYaxis()->SetLabelFont(42);
   hist03->GetYaxis()->SetLabelSize(0.07);
   hist03->GetYaxis()->SetTitleSize(0.07);
   hist03->GetYaxis()->SetTitleOffset(1.2);
   hist03->GetYaxis()->SetTitleFont(42);
   hist03->GetZaxis()->SetLabelFont(42);
   hist03->GetZaxis()->SetLabelSize(0.07);
   hist03->GetZaxis()->SetTitleSize(0.07);
   hist03->GetZaxis()->SetTitleFont(42);
   hist03->Draw("");
   
   TPaveText *pt = new TPaveText(0,0.9018323,0.4148387,0.995,"blNDC");
   pt->SetName("title");
   pt->SetBorderSize(0);
   pt->SetFillColor(0);
   pt->SetFillStyle(0);
   pt->SetTextFont(42);
   TText *text = pt->AddText("Ch=38,10,13");
   pt->Draw();
   c1->Modified();
   c1->cd();
   c1->SetSelected(c1);

   // define pulse function

   Double_t xmin=0;
   Double_t xmax=100;

   TF1 *pulse = new TF1("pulse_func",pulse_func,xmin,xmax,5);
   Double_t mu=1/8.;    // unis of 1/x
   Double_t sigma=5;     // units of x 
   Double_t gain=500;   
   Double_t t0=40;
   Double_t pedestal=2;
   pulse->SetParameters(mu,sigma,gain,t0,pedestal);
   pulse->SetParNames("mu","sigma","gain","t0","pedestal");
  
   hist03->Fit(pulse);
   c1->SaveAs("fit_waveform03.pdf");

}
Double_t pulse_func (Double_t *x, Double_t *par) {

   Double_t mu=par[0];
   Double_t sigma=par[1];
   Double_t gain=par[2];
   Double_t t0=par[3];
   Double_t pedestal=par[4];
   Double_t x1=x[0]-t0;

   char string[256];

   Double_t func;
   Double_t amplitude;

   if (x1 < -20) {
           func = pedestal;
           }
   else if {

         Double_t arg = (mu*sigma*sigma-x1)/(sqrt(2)*sigma);
         Double_t arg2 = -mu*x1 +(mu*sigma)*(mu*sigma)/2;
         amplitude = (mu/2)* exp(arg2) *  TMath::Erfc(arg);
          func = gain * amplitude + pedestal;
  }
   
   /*sprintf (string,"x1=%f amplitude=%f mu=%f sigma=%f t0=%f pedestal=%f, func=%f\n",x1,amplitude,mu,sigma,pedestal,func);
   printf ("string=%s",string);*/

   return func;
}