Axis labels overlapped by pad

ROOT
28

this one is ok

void ratio() {
  float r = 0.3;
  float epsilon = 0.02;

  TH1F *h1 = new TH1F("h1", "test1", 100, -3, 3);
  h1->SetStats(0);
  h1->GetXaxis()->SetLabelSize(0.);
  h1->GetXaxis()->SetTitleSize(0.);
  h1->FillRandom("gaus", 200000);
  h1->SetMinimum(0.);

  TH1F *h2 = new TH1F("h2", "test2", 100 , -3, 3);
  h2->SetStats(0);
  h2->FillRandom("gaus", 100000);

  TCanvas *c1 = new TCanvas("c1", "example", 600, 700);
  TPad *pad1 = new TPad("pad1", "pad1", 0, r-epsilon, 1, 1);
  pad1->SetBottomMargin(epsilon);
  c1->cd();
  pad1->Draw();
  pad1->cd();
  h1->Draw();

  TPad *pad2 = new TPad("pad2", "pad2", 0, 0, 1, r*(1-epsilon));
  pad2->SetTopMargin(0);
  pad2->SetFillColor(0);
  pad2->SetFillStyle(0);
  c1->cd();
  pad2->Draw();
  pad2->cd();
  h2->Draw("ep");
}