Hi Bernd, This is not implemented, but you can easily get this functionality with a few additional lines of code. See example below. Rene void marks () { TFile *f = TFile::Open("hsimple.root"); //from tutorials TTree *ntuple = (TTree*)f->Get("ntuple"); Int_t n = ntuple->Draw("py:px","pz/5","a"); TMarker *m; for (Int_t i=0;i<n;i++) { m = new TMarker(ntuple->GetV1()[i],ntuple->GetV2()[i],24); m->SetMarkerSize(ntuple->GetW()[i]); m->Draw(); } } Bernd Reinhold wrote: > > Hi! > > I have a TTree T with three columns x, y, z. I'd like to plot x against y (with tv__tree->Draw("x:y", "", ""). > The size of the markers shall depend on z. > z is a double from the interval [0,1), with two digits precision. > > Any hint/ help is appreciated. > > Thanks, Bernd.
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