\begin{table}%t2
\caption{\label{tab:corr}Correlation coefficients $r$ and $r'$ between $L_{\rm SB}$ and $L_{\rm acc}$ in bins of objects considering the subsamples with 5$\sigma$~detections at 250~$\mu$m alone~($N$) and those with both~250 and 350~$\mu$m 5$\sigma$~detections ($N'$), respectively.}
%\centering
\par
\begin{tabular}{r r r c c}
\hline \hline \noalign{\smallskip}
$z$    & $N$ &  $N'$ &  $r$ & $r'$ \\
\hline
$z<0.5$     & 15 &  4  & 0.063 & -- \\
$0.5<z<1.0$ & 14 & 10  & 0.073 & 0.057 \\
$1.0<z<1.5$ &  9 &  6  & 0.054 & 0.241 \\
$1.5<z<2.0$ & 21 & 13  & 0.109 & 0.241 \\
$z>2.0$     & 18 & 16  & 0.496 & 0.468 \\
\hline
\end{tabular}
\end{table}