\begin{table}%t1
\caption{Ellipses parameters in the ($Q$, $U$) plane.} \label{tab-ell}
%\centering
\par
\begin{tabular}{lcc}
\hline \hline
Parameter & 4300~\AA & 5250~\AA\\
\hline
Ellipse center & (0.04, --1.63) & (0.26, --1.32)\\
Ratio of axes & 0.654 & 0.632\\
Eccentricity & 0.75 & 0.77\\
Rotation angle & --67.7\degr & --83.3\degr \\
\hline
\end{tabular}
\end{table}