void test2(){
 
auto c1 = new TCanvas("c1", "A ratio example");

	TFile *f1 = new TFile("tutorial1afinal.root","READ");
	TFile *f2 = new TFile("ZHerwig.root","READ");

	TTree *t11= (TTree*)f1->Get("tree1");
	TTree *t22= (TTree*)f2->Get("tree1");
	
double m0,m00,m1,m11,m2,m22,Mm1,Mm11;
int i;

	t11->SetBranchAddress("eta11",&m11);
	t22->SetBranchAddress("Meta11",&m22);

	TH1F *h1= new TH1F("h1","#eta",100,-3,3);
	TH1F *h2= new TH1F("h2","#eta",100,-3,3);

int n11 =t11->GetEntries();
int n22 =t22->GetEntries();

  
    	for (i=0; i<n11; i++) {
      		t11->GetEntry(i);  
            	h1->Fill(m11);
         	   }
   	for (i=0; i<n22; i++) {
      		t22->GetEntry(i);  
      		h2->Fill(m22);
   			}
   			
TString title = Form("#font[60]{p-p collisions, 13.6 TeV}");
TLatex tex;
	tex.SetTextFont(42);   			
TLegend *legend1 = new TLegend(0.3,0.7,0.5,0.9);
  	 legend1->AddEntry(h1,"eta:e-","l");
   	legend1->AddEntry(h2,"eta:mu-","l");
   	
h2->SetLineColor(2);
h2->SetLineWidth(2);
h1->SetLineColor(4);
h1->SetLineWidth(2);

   		legend1->Draw();
   		
auto rp1 = new TRatioPlot(h2,h1);
	   rp1->SetGraphDrawOpt("lines");
   //rp1->SetSeparationMargin(0.0);
	   rp1->Draw();
	   rp1->GetLowerRefYaxis()->SetTitle("ratio");
     //   rp1->GetLowerRefXaxis()->SetTitle("#eta");
  	   rp1->GetUpperRefYaxis()->SetTitle("entries");
           rp1->GetUpperRefXaxis()->SetTitle("#eta");
   	   rp1->GetLowerRefGraph()->SetMinimum(-0.4);
   	   rp1->GetLowerRefGraph()->SetMaximum(2);
   	   
   	   tex.DrawLatex(0.18,0.87,title);
}