void RootTutorial1() {

  // Get the data file
  cout << "[root_tutorial_1] Getting data file" << endl;
  TFile *f = new TFile("./zjet.root");
  // Get the tree from the file
  cout << "[root_tutorial_1] Getting TTree from file" << endl;
  TTree *t = (TTree*)f->Get( "Tdata" );
  
  // Create a 1D histogram
  cout << "[root_tutorial_1] Creating histogram object (TH1F)" << endl;
  TH1F *h_px = new TH1F("h_px","h_px",100,-1500,1500);
  // Fill the histogram using information from the "px" branch from the tree
  cout << "[root_tutorial_1] Filling histogram and drawing it" << endl;
  t->Draw("px>>h_px");

}