\begin{table}%t3
 %\centering
\par
  \caption {\label{tab:M31M33}Parameters of M~31 and M~33.}
  \begin{tabular}{lllll}
    \hline
    \hline
    Galaxy & Declination           & Distance (kpc)               & Mass ($M_\odot$)                             & Angular extent \\
    \hline
    M~31    & 41$^\circ$ 16$\arcmin$ & 772~$\pm$~44 \citep{Ribas05}   & $8.2\times 10^{11}$ \citep{Seigar08}         & 3~deg$^2$\\
    M~33    & 30$^\circ$ 39$\arcmin$ & 964~$\pm$~54 \citep{Bonanos06} & $\ga $$5\times 10^{10}$ \citep{Corbelli00} & 0.8~deg$^2$\\
    \hline
  \end{tabular}
  \end{table}