void timediff( char src[200] )
{
  FILE *outf;
  outf=fopen("timeinf.txt","w");
  TFile *pRootFile = new TFile(src);
  TTree *pTreeCoin = (TTree*)pRootFile->Get("Coincidences");
  double time1;
  double time2;
  int eventID1;
  int nentries = (int) pTreeCoin -> GetEntries();
  int nBug=0;  

  pTreeCoin->SetBranchAddress("time1",&time1);
  pTreeCoin->SetBranchAddress("time2",&time2);
  pTreeCoin->SetBranchAddress("eventID1",&eventID1);

  for(int i=0 ; i<nentries ; i++){
    pTreeCoin->GetEntry(i);
    fprintf(outf,"%1.12lf, %1.12lf\n",time1,time2);
    if( fabs(time1-time2)*1.0e12 > 100. ) nBug++;
  }
  printf("Total Coincidences event %d, coincidences events out of window %d\n", nentries, nBug);
  delete pTreeCoin;
  fclose(outf);
}