#include "TCanvas.h"
#include "TROOT.h"
#include "TH1D.h"
#include "TFile.h"

void macro() {
  TFile* f = new TFile("data.root");
  TH1D* h;
  f->GetObject("combined", h);
  std::cout << h->GetEntries() << std::endl;
  h->Draw(" A ");
}

int main() {
  macro();
}