{
   auto c48 = new TCanvas("c48","c48",200,10,600,400);
   float x[]     = {1,2,3};
   float err_x[] = {0,0,0};
   float err_y[] = {5,5,5};
   float y[]     = {1,4,9};
   auto tg = new TGraphErrors(3,x,y,err_x,err_y);
   c48->Divide(2,1);
   c48->cd(1); gPad->DrawFrame(0,0,4,8); tg->Draw("PC");
   c48->cd(2); gPad->DrawFrame(0,0,4,8); tg->Draw("0PC");
}