\begin{table}%T1
\par
\caption{\label{Tabelle}Pixel scale and image orientation of Omega-Cass for the different observing
runs. North is shifted by the orientation angle given below from the top of the image to right.}
%\centering
\par
\begin{tabular}{ccc}
\hline\hline
Epoch      & Pixel scale $[$mas$]$ & Orientation \\ \hline
01 Nov. 2001 &$77.40 \pm 0.20$&$11.80 \pm0.30^{\circ}$  \\
26 Apr. 2002 &$77.60 \pm 0.30$&$22.27 \pm0.05^{\circ}$  \\
23 Dec. 2002 &$77.46 \pm 0.05$&$18.60 \pm0.10^{\circ}$  \\
\hline
\end{tabular}
\end{table}