void fit_waveform06(void)
{
//=========Macro generated from canvas: c1/c1
//=========  (Wed Dec 17 14:49:16 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 *hist06 = new TH1F("hist06","Ch=40,04,05",100,0,100);
   hist06->SetBinContent(1,2);
   hist06->SetBinContent(2,1);
   hist06->SetBinContent(3,2);
   hist06->SetBinContent(4,2);
   hist06->SetBinContent(5,4);
   hist06->SetBinContent(6,1);
   hist06->SetBinContent(7,1);
   hist06->SetBinContent(8,2);
   hist06->SetBinContent(9,5);
   hist06->SetBinContent(10,3);
   hist06->SetBinContent(11,5);
   hist06->SetBinContent(12,2);
   hist06->SetBinContent(13,2);
   hist06->SetBinContent(14,3);
   hist06->SetBinContent(15,3);
   hist06->SetBinContent(17,2);
   hist06->SetBinContent(18,1);
   hist06->SetBinContent(19,2);
   hist06->SetBinContent(20,2);
   hist06->SetBinContent(21,1);
   hist06->SetBinContent(22,2);
   hist06->SetBinContent(23,1);
   hist06->SetBinContent(24,3);
   hist06->SetBinContent(25,2);
   hist06->SetBinContent(26,2);
   hist06->SetBinContent(27,2);
   hist06->SetBinContent(29,1);
   hist06->SetBinContent(30,3);
   hist06->SetBinContent(31,1);
   hist06->SetBinContent(32,1);
   hist06->SetBinContent(33,5);
   hist06->SetBinContent(34,3);
   hist06->SetBinContent(35,3);
   hist06->SetBinContent(36,2);
   hist06->SetBinContent(37,3);
   hist06->SetBinContent(38,5);
   hist06->SetBinContent(39,15);
   hist06->SetBinContent(40,20);
   hist06->SetBinContent(41,23);
   hist06->SetBinContent(42,25);
   hist06->SetBinContent(43,20);
   hist06->SetBinContent(44,21);
   hist06->SetBinContent(45,18);
   hist06->SetBinContent(46,19);
   hist06->SetBinContent(47,14);
   hist06->SetBinContent(48,15);
   hist06->SetBinContent(49,14);
   hist06->SetBinContent(50,10);
   hist06->SetBinContent(51,11);
   hist06->SetBinContent(52,8);
   hist06->SetBinContent(53,8);
   hist06->SetBinContent(54,8);
   hist06->SetBinContent(55,7);
   hist06->SetBinContent(56,7);
   hist06->SetBinContent(57,9);
   hist06->SetBinContent(58,8);
   hist06->SetBinContent(59,7);
   hist06->SetBinContent(60,7);
   hist06->SetBinContent(61,9);
   hist06->SetBinContent(62,9);
   hist06->SetBinContent(63,5);
   hist06->SetBinContent(64,8);
   hist06->SetBinContent(65,4);
   hist06->SetBinContent(66,8);
   hist06->SetBinContent(67,6);
   hist06->SetBinContent(68,3);
   hist06->SetBinContent(69,6);
   hist06->SetBinContent(70,3);
   hist06->SetBinContent(71,4);
   hist06->SetBinContent(72,4);
   hist06->SetBinContent(73,3);
   hist06->SetBinContent(74,5);
   hist06->SetBinContent(75,5);
   hist06->SetBinContent(76,3);
   hist06->SetBinContent(77,3);
   hist06->SetBinContent(78,3);
   hist06->SetBinContent(79,3);
   hist06->SetBinContent(80,2);
   hist06->SetBinContent(81,2);
   hist06->SetBinContent(82,6);
   hist06->SetBinContent(83,4);
   hist06->SetBinContent(84,3);
   hist06->SetBinContent(85,4);
   hist06->SetBinContent(86,3);
   hist06->SetBinContent(87,4);
   hist06->SetBinContent(88,4);
   hist06->SetBinContent(89,6);
   hist06->SetBinContent(90,4);
   hist06->SetBinContent(91,3);
   hist06->SetBinContent(92,4);
   hist06->SetBinContent(93,2);
   hist06->SetBinContent(94,3);
   hist06->SetBinContent(95,2);
   hist06->SetBinContent(97,5);
   hist06->SetBinContent(98,1);
   hist06->SetBinContent(99,2);
   hist06->SetBinContent(100,3);
   hist06->SetMaximum(84);
   hist06->SetEntries(1100);
   // hist06->SetStats(0);
   hist06->SetLineColor(2);
   hist06->GetXaxis()->SetTitle("sample   (4 ns)");
   hist06->GetXaxis()->SetNdivisions(505);
   hist06->GetXaxis()->SetLabelFont(42);
   hist06->GetXaxis()->SetLabelSize(0.07);
   hist06->GetXaxis()->SetTitleSize(0.07);
   hist06->GetXaxis()->SetTitleFont(42);
   hist06->GetYaxis()->SetTitle("ADC value");
   hist06->GetYaxis()->SetNdivisions(505);
   hist06->GetYaxis()->SetLabelFont(42);
   hist06->GetYaxis()->SetLabelSize(0.07);
   hist06->GetYaxis()->SetTitleSize(0.07);
   hist06->GetYaxis()->SetTitleOffset(1.2);
   hist06->GetYaxis()->SetTitleFont(42);
   hist06->GetZaxis()->SetLabelFont(42);
   hist06->GetZaxis()->SetLabelSize(0.07);
   hist06->GetZaxis()->SetTitleSize(0.07);
   hist06->GetZaxis()->SetTitleFont(42);
   hist06->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=40,04,05");
   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");
  
   hist06->Fit(pulse);
   c1->SaveAs("fit_waveform06.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;
}