{
Double_t xAxis[9] = {2, 2.5, 3, 3.5, 4.25, 5, 6, 8.5, 12}; 
TH1 *hist = new TH1F("hist","title",8, xAxis);
hist->SetBinContent(1,3.50263);
hist->SetBinContent(2,3.0382);
hist->SetBinContent(3,2.06942);
hist->SetBinContent(4,0.972177);
hist->SetBinContent(5,0.540279);
hist->SetBinContent(6,0.230154);
hist->SetBinContent(7,0.0632342);
hist->SetBinContent(8,0.00771603);

Int_t bin = 7;
Float_t x1 = hist->GetBinLowEdge(bin);
Float_t x2 = x1 + hist->GetBinWidth(bin);
Float_t y1 = hist->GetBinContent(bin);
Float_t y2 = y1 + 1.;   
TBox *box = new TBox(x1, y1, x2, y2);


TCanvas *c = new TCanvas("can", "can", 700, 400);
c->Divide(2,1);
c->cd(1);
hist->Draw();
box->Draw();
c->cd(2);
hist->Draw();
box->Draw();
TVirtualPad::Pad()->SetLogy();
}