I think you use the software to draw it!
The following code works:
%LimeGreen: Curva PC
%Gray: Región de soluciones
\psbezier(0.8, 2)(5, 3.8)(7, 6)(8.6, 8.5)
\psbezier(0.83, 6)(1.5, 3.9)(5.655, -0.6)(9.65, -1.67)
I have some regex search and replace which converts most of PSTricks code to TikZ, but is far from perfect. While I am sure you can do that in PSTricks (with \pscustom if I remember correctly), you may just switch to TikZ with which it is really easy.
Thank You very much!!!!
I have another questions: what is the thickness of the contour's line when I put dotLW=1? And, without "dotLW", what is the thickness of the contour's line by default for PointSymbol=o?