void test(){
  Color_t colors[] = {kRed, kBlue, kGreen+2};

  TFile* infile = TFile::Open("test.root");
  TH1D* hist_data = (TH1D*) infile->Get("hist_data");
  hist_data->SetMarkerStyle(20);

  THStack* mcstack = (THStack*) infile->Get("mcstack");
  for(uint imc=0; imc<3; imc++){
    TH1D* hist_mc = (TH1D*) mcstack->GetStack()->At(imc);
    hist_mc->SetLineColor(colors[imc]);
    hist_mc->SetFillStyle(1001);
    hist_mc->SetFillColorAlpha(colors[imc], 0.35);
  }


  //THIS WORKS...
  // TCanvas* c1 = new TCanvas();
  // hist_data->Draw("E");
  // mcstack->Draw("hist same");

  //THIS DOESN'T...
  TCanvas* c1 = new TCanvas();
  hist_data->Draw("axis");
  mcstack->Draw("hist same");
  hist_data->Draw("E same");
}