//TChain for ttH_dilep
  std::ifstream file2 ("ttH_dilep.txt");
  std::string str2;
  std::string file_contents2;
  std::string treename2;
  
  TChain *ch2 = new TChain ("nominal");
  while (std::getline(file2,str2))
    {
      file_contents2 = str2;
      const char* filename2 = file_contents2.c_str();
      std::cout << "name: " << filename2 << "\n";
      treename2 = file_contents2 + "/nominal";
      const char* name2 = treename2.c_str();
      ch2->AddFile(name2);
    }


  TTree *ttHTree_dilep = new TTree("ttH_dilep", "ttH_dilep");
  ttHTree_dilep = (TTree*)ch2->CloneTree(0);

  for(Int_t ievt = 0; ievt < ch2->GetEntries(); ievt++){
    ch2->GetEntry(ievt); 
    if(jet_e_ttH_dilep->size() == 4 && ejets_2016_ttH_dilep == 1){
      cross_section4 = 0.22276;
      ttHTree_dilep->Fill();
     
    }
  }