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

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

	f1->Draw("glsurf2");
	f1->GetHistogram()->GetXaxis()->SetTitle("X [pixels]");
	f1->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);

}