{
	gStyle->SetCanvasPreferGL(kTRUE);
	TCanvas *c = new TCanvas("c", "c", 1000, 500);
	c->Divide(2,1);

	TF2 *f1 = new TF2("f1", "x^2+y^2");

	c->cd(1);
//	f1->GetHistogram()->SetTitle("aaa");
	f1->GetHistogram()->GetXaxis()->SetTitle("X [pixels]");
	f1->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);
	f1->Draw("glsurf2");
	gPad->Modified();
	gPad->Update();

	TF2 *f2 = new TF2(*f1);
	f2->SetName("f2");
	f2->SetRange(-10, -10, 10, 10);
	f2->SetTitle("bbb");
	f2->GetHistogram()->SetTitle("bbb");

/*
	c->cd(2);

	f2->GetHistogram()->GetXaxis()->SetTitle("X [pixels]");
	f2->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);
	f2->Draw("glsurf2");	
	f2->SetTitle("bbb");
	f2->GetHistogram()->SetTitle("bbb");

	gPad->Modified();
	gPad->Update();
*/

}