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Hi, I am sure there is a good reason why I donĀ“t seem to be able to do: Plot3D[Evaluate[Abs[zin2/.{f->f0}]], {ca, c1/2, 2*c1}, {cb, c2/2, 2*c2}, FaceGrids-> {{{0,0,1}, {{c1},{c2}}}, {{1,0,0}, {{c2},Automatic}}, ...