{
  // TFile *f1 = new TFile(“/home/ayad/research/belle2/software-new/cosmicdata/reconstructed.root”);
  TFile *f1 = new TFile("reconstructed.root");
  f1->ls();
  //  TTree *t = (TTree *)f1->Get("persisten");
    TTree *t = (TTree *)f1->Get("tree");
  // t->Print();
    t->MakeClass("cosmictree");
    //  t->MakeClass("persistent");
}