\begin{table}%t1
\caption{Imaging log.}
\label{filters}
%\begin{center}
{\begin{tabular}{lll}
            \noalign{\smallskip}
\hline\hline
  \hnii\        & \sii\         & \oiii\    \\
\hline
4800$^{a}$(2)$^{b}$   &4800 (2)&7200 (3)     \\
 \hline
6560$^{\rm c}$ \AA\ (75 \AA)$^{d}$   & 6708 \AA\ (20 \AA) 
& 5005 \AA\  (28 \AA) \\
 \hline
\end{tabular}}
\parbox{7.5cm}{
${^a}$ Total exposure time in s. \\\
${^b}$ Number of individual frames. \\\
${^c}$ Central wavelength. \\\
${^d}$ Full width at half maximum. }
%\end{center}
\par
   \end{table}