[pstricks] RE : Avoid lines in psplotImp

[Chicoine Martin]

>\begin{psgraph*}(0,0)(-6,-6)(8,6){8cm}{!}
>  \psplotImp[linecolor=violet](-7,-7)(8,0){x^3*y^2-3*x^2*y^3-(16)}
>  \psplotImp[linecolor=red](-7,-7)(0,0){x^3*y^2-3*x^2*y^3-(16)}
>\end{psgraph*}
>
>Herbert

Great! Many thanks.
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