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void root() {
// Set the style.
gStyle->SetTextFont(80); gStyle->SetLabelFont(80,"XYZ");
gStyle->SetTitleFont(80,""); gStyle->SetTitleFont(80,"XYZ");
gStyle->SetPalette(1); gStyle->SetOptStat(0);
// Draw the plot.
TH2D *h = new TH2D("", "", 25, 0, 3.9, 25, 0, 3.9); TRandom r;
for (int i = 0; i < 30000; i++) h->Fill(r.Gaus(2.,1), r.Gaus(2.,1));
h->GetXaxis()->CenterTitle(); h->GetXaxis()->SetTitleOffset(2.5);
h->GetYaxis()->CenterTitle(); h->GetYaxis()->SetTitleOffset(2.5);
h->GetXaxis()->SetTitle("\\larger[2]$x$");
h->GetYaxis()->SetTitle("\\larger[2]$y$");
h->Draw("LEGO2");
// Draw additional text.
TText *t = new TText(); t->SetTextAlign(31);
t->DrawText(0.7, 0.9, "\\larger[2]$z(x,y) = \\frac{1}{\\sigma_x\\sigma_y"
"\\sqrt{4\\pi^2}}\\exp\\left(- \\left(\\frac{(x-\\mu_x)^2}"
"{2\\sigma_x^2} + \\frac{(y-\\mu_y)^2}{2\\sigma_y^2} \\right)"
"\\right)$");
// Print the plot.
gPad->Print("root.svg");
}
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