void dumpHistoToTxt()
{
TFile *f=new TFile("SPEC_TotalFotoesA.root"); // opens the root file
//TH1F *tr=(TH1F*)f->Get("SPEC_TotalFotoes1");
TH1F *tr; f->GetObject("energy", tr);

float energy,count, value_normalized;
double integral = 1.0/(tr->Integral());
double integ = tr->Integral();

   
ofstream myfile;
myfile.open ("TotalFotoes_espMinA1.txt");
//myfile.open ("values1.txt"); value_normalized
myfile << "energy count \n";

for (int idx=0; idx<tr->GetNbinsX();++idx) {
   energy = tr->GetBinCenter(idx);
   count = (tr->GetBinContent(idx));
   //value_normalized = count * (integral);
   // value_normalized = count/integ;
   cout << energy << " " << count << endl; //print to the screen
   myfile << energy << " " << count << "\n"; //write to file
   
//   cout << energy << " " << value_normalized <<endl; //print to the screen
//   myfile << energy << " " << value_normalized << "\n"; //write to file

}

cout<<"integral = " << integ << endl;

myfile.close();
}