void same() {
	TF2 *xyg = new TF2("xyg","xygaus",0,10,0,10);
	xyg->SetParameters(1,5,2,5,2);  //amplitude, meanx,sigmax,meany,sigmay
	
	TH2F *h2st0 = new TH2F("h2st0","h2st0",20,-4,4,20,-4,4);
	h2st0->SetFillColor(32);
	h2st0->FillRandom("xyg",4000);
	h2st0->Draw("E2");
	
	THStack *a = new THStack("a","Stacked 2D histograms");
	TH2F *h2sta = new TH2F("h2sta","h2sta",20,-4,4,20,-4,4);
	h2sta->SetFillColor(38);
	h2sta->FillRandom("xyg",1000);
	
	TH2F *h2stb = new TH2F("h2stb","h2stb",20,-4,4,20,-4,4);
	h2stb->SetFillColor(46);
	h2stb->FillRandom("xyg",1000);
	
	a->Add(h2sta);
	a->Add(h2stb);
	a->Draw("SAME");
}