\documentclass{ppex}
\nonstopmode
\usepackage {graphics,pspicture}
\pagestyle{empty}
\setlength\textwidth{207.0pt}
\begin{document}
\ResetPreambleCommands
\ReadyForTheFray
\usepackage {graphics,pspicture}
\begin{tabular}{rrr}
\rotatebox{45}{ Column 1} &
\rotatebox{45}{ Column 2} &
\rotatebox{45}{ Column 3}     \\\hline
1& 2& 3 \\ 4& 5& 6 \\ 7& 8& 9 \\\hline
\end{tabular}
\end{document}