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Hi everybody, I need a little help from you on the following piece of code.
\documentclass[a4paper]{article}
\usepackage[margin=1cm]{geometry}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{pstricks}
\usepackage{pst-all}

\begin{document}
\begin{pspicture}(-3,-1)(3,5)
\psset{linecolor=Blue ...