Hi Annalisa, If you mean a TF2, then you need to access the histogram used to draw the function, from which you can access the appropriate axes: TF2 *ex = new TF2(........); ex->GetHistogram()->GetXaxis()->SetTitle("x"); ex->GetHistogram()->GetYaxis()->SetTitle("y"); Hope this helps, Ben. -- ------------------------------------------------------------------------------- Mr. Ben Morgan Tel: 44 (0)114 22 23553 (Work) Postgraduate Student University of Sheffield Department of Physics & Astronomy Hicks Building Hounsfield Road Sheffield S3 7RH -------------------------------------------------------------------------------
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