{
  TGraphErrors *gr = new TGraphErrors(2);
  gr->SetPoint(0,0,0);
  gr->SetPoint(1,1,1);
  gr->SetPointError(0,.0002,.2);//why do I need 0.0002 to make a plot 
  gr->SetPointError(1,0,.3);
  gr->SetMarkerStyle(21);
  gr->Draw("ap");
  TLegend *leg = new TLegend(0.4,0.8,0.7,1);
  leg->AddEntry(gr,"no error lines","pe");
  leg->AddEntry(gr,"The horizonal lines, why?","pel");
  leg->Draw();
}