\documentclass{ppex}
\nonstopmode
\usepackage [frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [frame]{xy}
\[\begin{xy}
0*+[o][F]{DL};<2cm,1cm>*+[F]{UR} **@{.}
?<*@{<<} ?(0.5)*!/_3mm/{\Omega} ?>>>*@{>}
\end{xy}\]
\end{document}

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