#include "TPad.h"
void Overlap_3(){
   TCanvas* c = new TCanvas("c","c",500,500);
//   Double_t eps = 0.005;
   Double_t eps = 0.2;
   int N = 4;
//   double x[4] = {0.3,0.6,0.6,0.3};
//   double y[4] = {0.3,0.6,0.6,0.3};
   TPad* p1 = new TPad("p1","p1",0.01,0.01,0.99,0.99,0); p1->Draw();
   TPad* p2 = new TPad("p1","p1",0.1,0.1,0.9,0.9,0); p2->Draw();
   p2->SetFillStyle(4000); //Pad2 is transparent

    //Draw rectangle regions
//   TPave *region= new TPave(0.3,0.3,0.6,0.6,1,"NDC");
    TPave *region= new TPave(0.3,0.3,0.6,0.6,1);
    region->SetLineColor(kRed);
    region->SetLineStyle(1);
    region->SetLineWidth(2);
    region->SetFillStyle(4000);

    //Draw Polygon regions by user coordinates. User coordinates are equal to NDC coordinates in an empty TPad.
    Double_t x[5] = {.2,.7,.6,.25,.2};
    Double_t y[5] = {.5,.6,.8,.7,.5};
    TPolyLine *pline = new TPolyLine(5,x,y);
    pline->SetLineStyle(1);
    pline->SetLineColor(2);
    pline->SetLineWidth(2);
    pline->SetFillStyle(4000);

   TH1F* h1 = new TH1F("h1","",100,-2.5,2.5);
   TH1F* h2 = new TH1F("h2","",100,-2.5,2.5);
   h1->Fill(0,12000.);
   h2->Fill(0,1.5);
   p1->cd();
   h1->Draw();
   p2->Modified();
   p2->Update();

   p2->cd();
   region->Draw("f");
   pline->Draw();
   p2->Modified();
   p2->Update();
   c->cd();
//   p2->SetEditable(kFALSE);
}