\begin{table}%t3
\caption{\label{tabnc}Slope of number counts of  \mbox{ADF-S} sources.}
%\centering
 \begin{tabular} {lcc}
\hline \hline \noalign{\smallskip}
Objects & 10$\sigma$ sample & 6$\sigma$ sample \\
 & $S_{90~\mu{\rm m}}>0.0482$~Jy & $S_{90~\mu{\rm m}}>0.0301$~Jy \\
\hline
All & --$1.63 \pm 0.03$ & --$1.58 \pm 0.02$ \\
Identified & --$1.45 \pm 0.03$ & --$1.34 \pm 0.02$ \\
Not identified & --$3.15 \pm 0.09$ & --$2.55 \pm 0.04$ \\
Known~$z$ & --$0.84 \pm 0.05$ & --$0.77 \pm 0.04$ \\
\hline
\end{tabular}
\end{table}