\begin{table}%t4
      \caption{\label{optical_results}XMM-Newton optical monitor results.}
        %\centerline
{\small
         \begin{tabular}{c c c c c}
            \hline\hline
            \noalign{\smallskip}
 Band & $T_{1}$\tablefootmark{a} & $F_{1}$ & $T_{2}$\tablefootmark{a} & $F_{2}$\\
 & [ks] & [mJy]& [ks] & [mJy]\\
            \noalign{\smallskip}
            \hline
               $V$ & 4.3 & 0.33 & 3.8 & 0.32\\
               $B$ & 3.9 & 0.22 & 4.3 & 0.21\\
               $U$ & 3.9 & 0.24 & 4.3 & 0.23\\
               $UVW1$ & 4.4 & 0.24 & 4.4 & 0.23\\
            \hline
       \end{tabular}}
       \tablefoot{\tablefoottext{a}{The OM exposures ($T$) and fluxes ($F$) are reported
for each filter on MJD 53~534 ($T_1$ \& $F_1$) and 53~536 ($T_2$ \& $F_2$).}}
   \end{table}