\begin{table}%t1
\caption{\label{tab:sample}AGN sample reference, field, type, number of objects, objects with 5$\sigma$~detections at 250~$\mu$m and at both~250 and~350~$\mu$m.}
\par
%\centering
\par
\begin{tabular}{l c r  c}
\hline \hline \noalign{\smallskip}
Sample & Type & Nobj & 5$\sigma$ 250 $\mu$m\\
       &      &      & (and 350 $\mu$m) \\
\hline
SDSS (LS) & 1 & 168 &  44 (26) \\
SDSS (FLS) & 1 & 86  &  29 (21) \\
Papovich et~al. (\cite{papovich06}) (FLS) & 1 & 159 &  71 (42) \\
Lacy et~al. (\cite{lacy07}) (FLS) & 2 & 20  &   5 (2) \\
\mbox{Mart\'{\i}nez-Sansigre} et~al. (\cite{martinez06}) (FLS) & 2 & 16 & 5 (4)\\
Polletta et~al. (\cite{polletta06}) (LS) & 2 & 11  &   2 (1) \\
Mainieri et~al. (\cite{mainieri02}) (LS) & 2 & 9   &   0 (0) \\
\hline                  
Total         &   & 469 & 156 (96) \\
\hline 
\end{tabular}
\end{table}