\begin{table}%t3
\par
\caption{\label{stack2}Derived values from the stacked flux densities$^a$.}
%\centerline
 {
\begin{tabular}{lcccccccccccc}
\hline\hline
Sample & $N$ & $z$ & $F_{\rm{1.2~mm}}$ & $F_{\rm{20~cm}}$ & $F_{\rm{1.2~mm}}$/$F_{\rm{24~\mu m}}$ & $L_{\rm{1.4~GHz}}$ & $L_{\rm{FIR,mm}}$$^{c}$ & $L_{\rm{FIR,radio}}$ & {\it SFR}$_{\rm{mm}}$ & {\it SFR}$_{\rm{radio}}$ & $q$ \\
       &   &   & (mJy)         & ($\mu$Jy)    & & (10$^{24}$~W~Hz$^{-1}$) &  \multicolumn{2}{c}{(10$^{12}$~$L_{\odot}$)} &  \multicolumn{2}{c}{($M_{\odot}$~yr$^{-1}$)} & \\
\hline
All    & 33 & 2.08 & 1.56~$\pm$~0.22 & 92.6~$\pm$~12.0 & 2.76~$\pm$~0.50 & 2.03~$\pm$~0.26 & 2.45~$\pm$~0.35 & 4.14~$\pm$~0.53 & 441 & 745 & 2.11~$\pm$~0.12 \\
{\it S/N}~$>$~3$^{b}$ & 13 & 2.11 & 2.83~$\pm$~0.14 & 128.5~$\pm$~26.0 & 4.94~$\pm$~0.51 & 2.89~$\pm$~0.58 & 3.99~$\pm$~0.20 & 5.90~$\pm$~1.18 & 718 & 1062 & 2.17~$\pm$~0.11\\
$S/N$~$<$~3$^{b}$ & 20 & 2.06 & 0.72~$\pm$~0.18 & 69.3~$\pm$~7.4 & 1.28~$\pm$~0.40 & 1.48~$\pm$~0.16 & 1.38~$\pm$~0.35 & 3.02~$\pm$~0.32 & 248 & 543 & 2.00~$\pm$~0.16\\
\hline
\end{tabular}}
\par
\smallskip
$^a$ The average stacked flux densities are computed with equal weights to avoid biases. Their approximate rms are computed as the standard deviation of the mean.\\
$^{b}$ {\it S/N} at 1.2~mm.\\
$^{c}$ $L_{\rm{FIR,mm}}$ is computed with (Eq.~(3)) and the dust temperatures coming from the stacked SED (see text): 37~K for the entire sample, 36~K for the 13~sources with {\it S/N}~$>$~3 at 1.2~mm, and 39~K for the 20 sources with {\it S/N}~$<$~3.\\
\end{table}