{
	TF1 *f = new TF1("f", "gaus");
	f->SetParameter(0,  100);
	f->SetParameter(1,  0.0);
	f->SetParameter(2, 20.0);
	
	TCanvas *c = new TCanvas("c", "c", 0, 0, 800, 300);
	c->Divide(2, 1, 0.001, 0.001);
	
	TH1D *h = new TH1D("h", "h", 100, -50.0, 50.0);
	h->FillRandom("f");
	
	TH1D *h_copy = (TH1D*)h->Clone();
	
	c->cd(1);
	h_copy->Draw();
	
	h->SetBins(200, -50, 50);
	h->Rebuild();
	c->cd(2);
	h->Draw();
}