void Plot2Dproj()
{
	TCanvas *c1 = new TCanvas ( "c1", "2D Projections", 800, 0, 700, 700);
	c1->Divide(1,2);

// File A
	file_a = new TFile( "data/a.root");
	h3a = (TH3D*) file_a->Get( "hist1");
	TH2D *h2a = h3a->Project3D( "yx");
	c1->cd(1);
	h2a->Draw();

// File B
	file_b = new TFile( "data/b.root");
	h3b = (TH3D*) file_b->Get( "hist1");
	TH2D *h2b = h3b->Project3D( "yx2");
	c1->cd(2);
	h2b->Draw();
}