        int n = 70;
        TH1F h("h","test",n,0.,30.);
        TRandom3 rndm_engine;
        for (int i=0; i&lt;10000; ++i) h->Fill(rndm_engine->Gaus(15.,4.));
        TF1 f("f","gaus");
        h->Fit("f");
        gPad->SetLogx();
     }
     </pre>
</li>
<li> The following macro didn't draw any box. Because of a precision
     problem the filled bin was not drawn.
     <pre>
     {
        double yarr[] = { 1.0, 2.0, 3.0, 4.0 };
        double xarr[] = { 0.01, 0.02, 0.03, 0.04 };
        TH2D *h = new 