Wie erhalte ich einen glatten Rand bei beschränkten Plots?

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\documentclass{standalone}
\usepackage{pgfplots}
\usepgfplotslibrary{colormaps} 
\begin{document}
\begin{tikzpicture}
  \begin{axis}[
      colormap/autumn,
      view/el = 45
    ]
    \addplot3[
      restrict z to domain* = -12:12,
      surf,
      samples  =       70,
      domain   = -0.5:0.5,
      domain y = -0.5:0.5,
    ]
    {x*y/(x^2+y^2)^2};
    % the contour plot handler can *draw* a contour line, but it cannot fill:
    \addplot3[
      contour gnuplot={
        levels={12},
        labels=false,
      },
      samples  =       70,
      domain   = -0.5:0.5,
      domain y = -0.5:0.5,
    ]
    {x*y/(x^2+y^2)^2};
    % now we fill the contour:
    \addplot3[
        % 1000 is always the last entry in the colormap, i.e. point
        % meta max:
        /utils/exec={\pgfplotscolormapdefinemappedcolor{1000}},
        draw=none,
        fill=mapped color] 
        file {P_contourtmp0.table};
  \end{axis}
\end{tikzpicture}
\end{document}
 
 
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