void AnalysisLoop::Loop()
{
   if (fChain == 0) return;

// 1a  origVector = new std::vector<float>;
// 1   outputTTree->Branch(origVector", "std::vector<float>", origVector);
// 1b  delete origVector;

   Long64_t nentries(fChain->GetEntries());
   for (Long64_t jentry=0; jentry<nentries;jentry++) {
      Long64_t ientry = this->LoadTree(jentry);
      if (ientry < 0) break;
      fChain->GetEntry(jentry);

// 2      m_outputTTree->Branch(origVector", "std::vector<float>", origVector);

        // do something ...

        m_outputTTree->Fill();
      }

   }

   TFile outputntuple("out.root","recreate");
   m_outputTTree->Write();
   outputntuple.Close();

   return;
}