\begin{table}%t1
\caption{\label{tab:catalog}Catalog properties.}
\small%\centerline
 {
\begin{tabular}{ccccccc}
\hline \hline
%&&&&&&&& \\[-8pt]
Field & Area & Exposure & Flux limit$^{{a}}$ & Completeness$^{{b}}$ & Contamination$^{{b}}$ & \# sources \\
 & \tiny {($\rm{arcmin^{2}}$)} & \tiny {($\rm{s/pixel}$)} & \tiny {($\rm{\mu Jy}$)}& \tiny{($\%\ {\rm at}\ S=S_{\rm limit}$)} &  \tiny{($\%\ {\rm at}\ S=S_{\rm limit}$)}  &    \tiny{(${\rm with}\ S \ge S_{\rm limit}$)} \\
 \hline
EGS 24 & 548 &14~000 & 50 (5$\sigma$) & 75 & 11 & 4096\\
GOODS-S 24 & 91 & 35~000 & 30 (5$\sigma$)& 81 & 13 & 870 \\
GOODS-N 24 & 194 & 35~000 & 30 (5$\sigma$)& 81 &  13 & 2151\\
ECDFS-O 24 & 517 & 8000 & 70 (5$\sigma$)& 100 &  0 & 2474 \\
%\\
EGS 70 & 548 & 7200 & 3000 (6$\sigma$)& 77 & 10 & 322\\
GOODS-S 70 & 91 & 10~800 & 2500 (6$\sigma$)& 73 & 12 & 44 \\
GOODS-N 70 & 194 & 10~800 & 2500 (6$\sigma$)& 73 &  12 & 119 \\
ECDFS-O 70 & 517 & 5750 & 3500 (6$\sigma$)& 85 &  7 & 195 \\
\hline
\end{tabular}}
\medskip
$^{{a}}$~The level of the noise was calculated on the residual images and hence it combines the confusion, instrumental and photon noises. \\
$^{{b}}$ See text for the definition of the completeness and contamination.
\end{table}