void graph()
{
	
	 //Double_t x[n], y[n],ymin[n], ymax[n]; 
	auto mg = new TMultiGraph();
	auto gr1 = new TGraph("energy_loss_electronic.dat");
    auto gr2 = new TGraph("energy_loss_nuclear.dat");
   

	
	
	
   
   gr1->SetName("g");
   gr1->SetTitle("g");
   gr1->SetFillColorAlpha(42,0);
   
  // gr1->SetFillColor(kGray);
   
   
   
   
   
   
   //gr1->GetXaxis()->SetLabelOffset(999);
   //gr1->GetXaxis()->SetLabelSize(0);
  //gr1->GetXaxis()->SetRangeUser(1,220);
    gr1->GetXaxis()->SetTickLength(0);
    gr1->GetYaxis()->SetTickLength(0);
   
   gr1->SetLineColor(kBlue-2);
   gr1->SetMarkerStyle(7);
   gr1->SetMarkerColor(kBlue-2);
   gr1->SetMarkerSize(0.6);
   
   
    gr2->SetMarkerStyle(21);
    gr2->SetMarkerColor(46);
    gr2->SetMarkerSize(0.5);
   
   
   //mg->Add(gr1,"APL");
     
  //  mg->Add(gr2,"APL");
  
  // mg->Add(gr1);
 //  mg->Add(gr2);
   
  //gr->SetLineWidth(-7700);
 //gr->SetFillStyle(3003);
 //gr->SetFillColorAlpha(18,0.99);
 
  
mg->Draw("APL");
   
 //  gr->Write();

  
 gr1->Draw("APL");
// gr2->Draw("APL same");
 //gr2->Draw("L");
 gPad->RedrawAxis();
}