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#include <vector>
#include "TROOT.h"
#include "TFile.h"
#include "TDirectory.h"
#include "TChain.h"
#include "TObject.h"
#include "TCanvas.h"
#include "TMath.h"
#include "TLegend.h"
#include "TGraph.h"
#include "TH1.h"
#include "TH2.h"
#include "TH3.h"
#include "TTree.h"
#include "TF1.h"
#include "TPaveText.h"
void KeepOnlyGain()
{
TChain* tree = new TChain("SiStripCalib/APVGain");
tree->Add("Gains_Tree.root");
TFile* out_file = new TFile("Gains.root","recreate");
TDirectory* out_dir = out_file->mkdir("SiStripCalib","SiStripCalib");
out_dir->cd();
TTree* out_tree = tree->CloneTree(0);
out_tree->SetName("APVGain");
out_tree->Write();
int TreeStep = tree->GetEntries()/50;if(TreeStep==0)TreeStep=1;
for (unsigned int ientry = 0; ientry < tree->GetEntries(); ientry++) {
if(ientry%TreeStep==0){printf(".");fflush(stdout);}
tree->GetEntry(ientry);
out_tree->Fill();
}printf("\n");
out_file->Write();
out_file->Close();
}
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