\begin{table}%t1
%\centering
\par
\caption{Overview of the narrow-band observations. The ESO
  filter ID, their central wavelengths $\lambda _{\rm c}$, their 
bandwidth $bw$ ({\it FWHM}), the total integration time and the~50\% completeness 
limit are given.
\label{photo_nb}}
\begin{tabular}{ccccc}
\hline\hline
Filter & $\lambda _{\rm c}$  & $bw$  & Exp. time  & 50\% compl. \\
       & [\AA ]   & [\AA ] & [s] &  [mag] \\
\hline
FILT\_810\_7+107 & 8100 & 69 & 19800 & 25.56  \\
FILT\_815\_5+108 & 8150 & 53 & 21240 & 25.63  \\
FILT\_823\_6+109 & 8230 & 55 & 21240 & 25.67 \\
\hline
\end{tabular}
\end{table}