Master/texmf-dist/doc/latex/latex-graphics-companion/5-4-3.ltx


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\documentclass{ppex}
\nonstopmode
\usepackage [frame]{xy}
\pagestyle{empty}
\setlength\textwidth{183.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage [frame]{xy}
\[\begin{xy}
  0*+++{L}*\frm<2pt>{-,}
 ,(10,10)*++{M}*\frm{o};
  (20,15)*+{R}*\frm{=}**\frm{o-}
\end{xy}\]
\end{document}