[pstricks] bad point-meeting-behaviour

[Doris Wagner]

hi list,

is there some possibility to let the lines meeting at E not cross the  
point E to the left? (I really need to have such thick lines)

\documentclass{article}
\usepackage{pstricks}\usepackage{pstricks-add}

\begin{document}
\begin{pspicture}(-5,-1)(7,8)

\psgrid[subgriddiv=2,gridlabels=0pt]
\psaxes[arrowscale=2,linewidth=2pt]{->}(0,0)(-5,-1)(6.5,7)
\pspolygon[showpoints=true,linecolor=blue,linewidth=2pt]( 
-1,3)(2,0)(4,0)(1,3)(-3.5,4.5)
\uput{0.3}[u]{0}(-3.5,4.5){$E$}

\end{pspicture}
\end{document}