[pstricks] 4 different colors in a psplotImp curve

[Luis Lopes]

Dear list members,

Hello.

I am a new member of this list. This is my first email, hope I will be
able to send it correctly.

I have three requests concerning the code below:

1) I would like to have 4 different colors in the red curve,
one for which natural part of the curve.

2) the curve should stop around the point (13,-16).

3) the two label <-1> of the axes are not well placed. How NOT to put
them in the axes?

Thank you for your help.

Luis

\begin{document}
\thispagestyle{empty}
\begin{figure}[ht!] %[H] %
\begin{center}
\psset{xunit=0.5cm,yunit=0.5cm,algebraic=true,dotstyle=o,dotsize=3pt
0,linewidth=0.8pt,arrowsize=3pt 2,arrowinset=0.25}
\begin{pspicture*}(-5.1,-17)(17,7.5)
\psaxes{->}(0,0)(-4.4,-16.5)(16,4.8)[$x$,-135][$y$,-45]
\pscircle(2.5,3.1754264805){2.020726442}
\psplotImp[algebraic,linecolor=red,linewidth=2pt](-6.1,-18)(19,5){
y*(x^2-10*x+y^2)*11/14+(x^3-5*x^2+y^2*x+5*y^2)*5*sqrt(3)/14 }
\rput[tl](6.1,5.9){$\Gamma$}
\end{pspicture*}
\caption{Exercício 29 --- Lugar geométrico de $D_{_{\!b}}$ e $E_{_{b}}$.}
\label{figuraexer29b}
\end{center}
\end{figure}
\end{document}
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