\begin{table}%t8
\par
\caption {\label{tab:cat_comp}Main properties of the 4 catalogues used for investigating the added value of the different depths.}
%\centering
\par
\begin{tabular}{cccccc}
\hline\hline
Passband & Mag. limit & \# Det. & Density & False Dens.& Med. z\\
\hline
$i'$ & 24.5 & 158 & 50.8~$\pm$~6.4 & 16.6~$\pm$~4.8 & 0.6 \\
$i'$ & 25.0 & 169 & 54.4~$\pm$~7.0 & 16.9~$\pm$~5.4 & 0.6\\
$z'$ & 23.7 & 179 & 57.6~$\pm$~7.3 & 20.2~$\pm$~5.0 & 0.7\\
$z'$ & 24.5 & 247 & 79.7~$\pm$~9.1 & 20.3~$\pm$~5.4 & 0.8\\
\hline
\end{tabular}
\end{table}