[pstricks] No Tips?

[Jorge Luis Llanio]

Dear All,

I am new with PStricks. Perhaps, one of my first "creations" was (Linux
box):


\documentclass[a4]{seminar}
\usepackage{semcolor}
\usepackage{pst-all,fancybox}
\usepackage{amsmath,bm,calc,ifthen,amssymb,graphicx}
\usepackage[nomessages]{fp}
\input{seminar.bug}
\input{random.tex}
\input{pst-blur.tex}
\pagestyle{empty}
\slidesmag{0}
\begin{document}
\slideframe{none}
\begin{slide}
\begin{pspicture}(0,0)(220mm,150mm)
%\psgrid
\rput(5,9){\rnode{Oa}{{\LARGE ${\rm \bf O_{a}}$}}}
\rput(9,9){\rnode{Ob}{{\LARGE ${\rm \bf O_{b}}$}}}
\rput(11,6){\rnode{Oc}{{\LARGE ${\rm \bf O_{c}}$}}}
\rput(14.2,4.6){\rnode{Od}{{\LARGE ${\rm \bf O_{d}}$}}}
\ncline[nodesep=3pt,linecolor=black,linestyle=dashed]{Ob}{Oc}
\ncline[nodesep=2pt,linecolor=black]{Oa}{Ob}
\rput(8.2,7.8){\rnode{c1}{{\LARGE $\theta_{1}$}}}
\rput(12,7){\rnode{c2}{{\LARGE $\theta_{2}$}}}
\rput(9.6,6.8){\rnode{fi}{{\LARGE $\phi$}}}
\rput(7,9.4){\rnode{r1}{{\LARGE $r_{1}$}}}
\rput(10.4,8.4){\rnode{r2}{{\LARGE $r_{2}$}}}
\rput(12,5){\rnode{r3}{{\LARGE $r_{3}$}}}
\psarc[linecolor=gray](9,9){10mm}{185}{305}
\psarc[linecolor=gray](11,6){8mm}{350}{120}
\psarc[linecolor=black]{<-}(10.4,7){5mm}{70}{210}
\pswedge[fillstyle=solid,fillcolor=black](11.4,6){2.5}{-30}{-24}
\end{pspicture}
\end{slide}
\end{document}

Well, I read a paper in Journal of Chemical Physics and one picture from
there interested me, then I scanned it and I am sending it to the list.
I would like to recreate this picture within a slide environment, like
my firt "PStricks creation". Any Tips?

Thanks very much in advance,

                                                    Jorge
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