\begin{table}%t2
        \caption{Observations of the five SWAN fields included 
        in the analysis here. \textit{CE} is the encircled energy 
        reported by the adaptive optics system in real time. 
        The isoplanatic angle~$\theta_0$ 
        is that derived by the fit using point sources in the 
        fields (see Sect.~\ref{our}).}
\label{obstab}
%\centering
\par
        \begin{tabular}{l c c c c c}
        \hline
        \hline 
        Field & Date & Filter &  Exp. time & CE & $\theta_0$ \\
              &      &        &  (min)     & (\%)   & (\arcsec)
        \\
        \hline 
        SBSF~14 & 15.12.02 & $K_{\rm s}$ & 60 & 62 & 11.9\\
        SBSF~15 & 17.12.02 & $K_{\rm s}$ & 60 & 66 & 21.8\\
        SBSF~18 & 17.12.02 & $K_{\rm s}$ & 40 & 68 & 21.2\\
        SBSF~24 & 21.03.03 & $K_{\rm s}$ & 60 & 36 & 11.8\\
        SBSF~41 & 14.06.03 & $K_{\rm s}$ & 60 & 53 & 19.7\\
        \hline
        \end{tabular}
\end{table}