Hi, many thanks for your help, I do need the "cont4", i must use it for the picture. > To have the marker coordinate in the "CONT4 space" it is a be more tricky. > You should do something like: > > { > TFile f("hsimple.root"); > hpxpy->Draw("cont4"); > gPad->Update(); > TView *view = gPad->GetView(); > Double_t xyz1[3] = {1.0,3,1.}; > Double_t xyz2[3]; > view->WCtoNDC(xyz1, xyz2); > TMarker *m = new TMarker(xyz2[0], xyz2[1], 29); > m->Draw(); > } I tried your "routine". It seems to work when both coordinates are linear. It produces incorrect behavior when they are logarithmic. Instead of a marker at (1.0, 3.0), I get it at about (0.82, 2.6). Could you, please, help me, Thanks in advance, Best regards, Jacek.
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