void example_root_automatic_colors()
{
    // --- SELECT THE PALETTE
    gStyle -> SetPalette (100);



    // --- PREPARE SOME DATA
    std::vector <double> x      = {0., 1., 2., 3., 4., 5.};
    std::vector <double> y1     = {0., 1., 2., 3., 4., 5.};
    std::vector <double> y2     = {0., 2., 4., 6., 8., 10.};
    std::vector <double> err_x  = {0., 0., 0., 0., 0., 0.};
    std::vector <double> err_y  = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1};





    // --- CREATE THE Graphs
    TGraphErrors g1 (x.size(), &x[0], &y1[0], &err_x[0], &err_y[0]);
    TGraphErrors g2 (x.size(), &x[0], &y2[0], &err_x[0], &err_y[0]);

    g1.SetMarkerStyle(20);
    g2.SetMarkerStyle(20);

    g1.SetTitle("Graph #1");
    g2.SetTitle("Graph #2");







    // --- FIT
    g1.Fit("pol1");
    g2.Fit("pol1");






    // --- DRAW IN A TMULTIGRAPH
    TCanvas c ("c", "c", 1000, 800);
    TMultiGraph mg;
    mg.Add(&g1);
    mg.Add(&g2);

    mg.Draw("AP PMC PLC PFC");

    c.SetGrid();
    c.BuildLegend(0.15, 0.6, 0.4, 0.8);
    c.DrawClone();
}