NoiseSigma.cpp

{
	gSystem->Load("../libData.so");

	const Long64_t kFirstEvent = 128;

//	TFile fr("../data/dataDSR4/Neurad_7_08_NEW.root");
	TFile fr("../data/dataDSR4/analysis_07_8.root");
//	TFile fr("../data/dataDSR4/Neurad_081216_2NEW.root");
//	TFile fr("../data/dataTektronix/exp18.root");
//	TFile fr("../data/dataTektronix/analysisExp7.root");
	TTree *tr = (TTree*)fr.Get("atree");

	AEvent *event = new AEvent();
	tr->SetBranchAddress("Ach0.",&event);


	TCanvas *c1 = new TCanvas("c1","test",10,10,1000,600);
	c1->Divide(2,2);
	

	Double_t Noise[500];	
	TH1F *histNoise[4];
	TString var,con,histName;

	//TH1F *h1 = new TH1F("h1", "h1 title", 100, 0, 4.4);
	for (Int_t i=0;i<4;i++) {
		histName.Form("histNoise%d",i);
		histNoise[i] = new TH1F(histName.Data(),"Noise distribution",500,-0.003,0.003);

		tr->GetEntry(i+kFirstEvent);
		for(Int_t j = 100;j<600; j++) { // filling array with AmpPos
			Noise[j-100] = event->GetOnefAmpPos(j); 
			histNoise[i]->Fill(Noise[j-100]);
		}

		c1->cd(i+1);
		histNoise[i]->Draw();
		histNoise[i]->Fit("gaus");
		gStyle->SetOptFit();
		c1->Update();
	}



}