How to blunt sharp joints?

In the following figure we can see that the line joints are so sharp. How to make them blunt?

\documentclass[10pt,pstricks,border=15pt]{standalone}
\usepackage{pst-eucl}
\begin{document}
\begin{pspicture}(1.5,0)(10.5,7)
\psset{linecolor=blue,PointName=none,PointSymbol=none}
\pstGeonode[PosAngle={110,135,135,135,-60}](2.22,2.24){O}(9,6){C}(4.82,3.68){A}(6,4.34){B}(5.45,1.58){D}(6.87,1.29){E}(8.87,0.88){F}
\pstLineAB[nodesepB=-1]{O}{C}
\pstLineAB[nodesepB=-1.5]{O}{F}
\foreach \a\b\c\d\e\g in {A/F/C/D/G/-90,B/F/C/D/H/90,A/F/C/E/I/-80,B/I/E/H/J/-30}{\pstInterLL[PosAngle=\g]{\a}{\b}{\c}{\d}{\e}}
\psline(A)(F)(B)(I)
\psline(D)(C)(E)(H)
\pstLineAB[linestyle=dashed,nodesepA=-.5,nodesepB=-2]{O}{J}
\end{pspicture}
\end{document}


\psset{linecolor=blue,PointName=none,PointSymbol=none,linejoin=2}