void whiteoutEmpty(TH2D* hist) {
	Double_t xLow = 0;
	Double_t xUp = 0;
	Double_t yLow = 0;
	Double_t yUp = 0;
	hist->SetFillColor(kWhite);
	hist->TAttFill::Modify();

	for(Int_t i = 1; i <= hist->GetNbinsX(); ++i) {
		xLow = hist->GetXaxis()->GetBinLowEdge(i);
		xUp = hist->GetXaxis()->GetBinUpEdge(i);
		for(Int_t j = 1; j <= hist->GetNbinsY(); ++j) {
			if(hist->GetBinContent(hist->GetBin(i, j))) continue; //Ignore filled bins
			yLow = hist->GetYaxis()->GetBinLowEdge(j);
			yUp = hist->GetYaxis()->GetBinUpEdge(j);
			gPad->PaintBox(xLow, yLow, xUp, yUp);
			//gPad->PaintBox(xLow, yLow, xUp, yUp, "s"); //This doesn't work either
		}
	}
}