void di33() {
   gStyle->SetPadBorderMode(0);
   gStyle->SetTitleX(0.15);
   TCanvas *c1 = new TCanvas("c1");
   //build the pads
   double dpad = 9./28;
   TPad *pad1 = new TPad("pad1","",0,1-dpad,1-2*dpad,1);
   pad1->Draw();
   TPad *pad2 = new TPad("pad2","",1-2*dpad,1-dpad,1-dpad,1);
   pad2->Draw();
   TPad *pad3 = new TPad("pad3","",1-dpad,1-dpad,1,1);
   pad3->Draw();
   TPad *pad4 = new TPad("pad4","",0,1-2*dpad,1-2*dpad,1-dpad);
   pad4->Draw();
   TPad *pad5 = new TPad("pad5","",1-2*dpad,1-2*dpad,1-dpad,1-dpad);
   pad5->Draw();
   TPad *pad6 = new TPad("pad6","",1-dpad,1-2*dpad,1,1-dpad);
   pad6->Draw();
   TPad *pad7 = new TPad("pad7","",0,0,1-2*dpad,1-2*dpad);
   pad7->Draw();
   TPad *pad8 = new TPad("pad8","",1-2*dpad,0,1-dpad,1-2*dpad);
   pad8->Draw();
   TPad *pad9 = new TPad("pad9","",1-dpad,0,1,1-2*dpad);
   pad9->Draw();
   
   //draw histograms inside each pad with the same x any scale
   TH1F *h = new TH1F("h","h",100,-3.3,3.3);
   h->SetMinimum(0);
   h->SetMaximum(260);
   h->SetFillColor(42);
   h->GetXaxis()->SetLabelFont(53);
   h->GetXaxis()->SetLabelSize(12);
   h->GetYaxis()->SetLabelFont(53);
   h->GetYaxis()->SetLabelSize(12);
   
   pad1->cd();
   pad1->SetTopMargin(0);
   pad1->SetBottomMargin(0);
   pad1->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad2->cd();
   pad2->SetTopMargin(0);
   pad2->SetBottomMargin(0);
   pad2->SetRightMargin(0);
   pad2->SetLeftMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad3->cd();
   pad3->SetTopMargin(0);
   pad3->SetBottomMargin(0);
   pad3->SetLeftMargin(0);
   pad3->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad4->cd();
   pad4->SetTopMargin(0);
   pad4->SetBottomMargin(0);
   pad4->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad5->cd();
   pad5->SetTopMargin(0);
   pad5->SetBottomMargin(0);
   pad5->SetLeftMargin(0);
   pad5->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad6->cd();
   pad6->SetTopMargin(0);
   pad6->SetBottomMargin(0);
   pad6->SetLeftMargin(0);
   pad6->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad7->cd();
   pad7->SetTopMargin(0);
   //pad->SetBottomMargin(0);
   pad7->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad8->cd();
   pad8->SetTopMargin(0);
   pad8->SetLeftMargin(0);
   pad8->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
   pad9->cd();
   pad9->SetTopMargin(0);
   pad9->SetLeftMargin(0);
   pad9->SetRightMargin(0);
   h->FillRandom("gaus",1000); h->DrawCopy();
}