void test2()
{
  using namespace RooFit;

  const Int_t n1 = 3;
  Double_t bins1[n1+1] = { 0, 1, 2, 3 };
  const Int_t n2 = 2;
  Double_t bins2[n2+1] = { 10, 20, 40 };
  TH1D* h1 = new TH1D( "h1", "h1", n1, bins1 );
  h1->SetBinContent( 1, 30 );
  h1->SetBinContent( 2, 55 );
  h1->SetBinContent( 3, 50 );
  TH1D* h2 = new TH1D( "h2", "h2", n2, bins2 );
  h2->SetBinContent( 1, 45 );
  h2->SetBinContent( 2, 90 );
  //  h2->Draw();
  TH2D* h = new TH2D( "h", "h", n1, bins1, n2, bins2 );
  h->SetBinContent( 1, 1, 10 );
  h->SetBinContent( 1, 2, 20 );
  h->SetBinContent( 2, 1, 15 );
  h->SetBinContent( 2, 2, 40 );
  h->SetBinContent( 3, 1, 20 );
  h->SetBinContent( 3, 2, 30 );
						
  RooRealVar v1( "v1", "v1", bins1[0], bins1[n1], "a.u." );
  RooDataHist dh1( "dh1", "dh1", v1, h1 );
  RooHistPdf pdf1( "pdf1", "pdf1", v1, dh1 );
  RooRealVar v2( "v2", "v2", bins2[0], bins2[n2], "a.u." );
  RooDataHist dh2( "dh2", "dh2", v2, h2 );
  RooHistPdf pdf2( "pdf2", "pdf2", v2, dh2 );
  RooDataHist dh( "dh", "dh", RooArgList( v1, v2), h );
  RooHistPdf pdf( "pdf", "pdf", RooArgList( v1, v2), dh );

  RooPlot *frame1 = v1.frame( Title("v1_1D") );
  dh1.plotOn( frame1 );
  pdf1.plotOn( frame1, LineColor(kRed), LineStyle(kDashed) );
  new TCanvas();
  frame1->Draw();

  RooPlot *frame2 = v2.frame( Title("v2_1D") );
  dh2.plotOn( frame2 );
  pdf2.plotOn( frame2, LineColor(kRed), LineStyle(kDashed) );
  new TCanvas();
  frame2->Draw();

  RooPlot *frame1_ = v1.frame( Title("v1_2D") );
  dh.plotOn( frame1_ );
  pdf.plotOn( frame1_, LineColor(kRed), LineStyle(kDashed) );
  new TCanvas();
  frame1_->Draw();
  RooPlot *frame2_ = v2.frame( Title("v2_2D") );
  dh.plotOn( frame2_ );
  pdf.plotOn( frame2_, LineColor(kRed), LineStyle(kDashed) );
  new TCanvas();
  frame2_->Draw();

}