\begin{table}%t1
\caption{\label{tsurveys}Details of the 1.2~mm surveys from which our source sample has been selected.}
%\centering
\par
\begin{tabular}{llccccc}
\hline \hline \noalign{\smallskip}
Author & Instrument-Telescope & \# sources & Dec  & {\it HPBW} ($''$) & $T_{\rm D}$?\tablefootmark{a} & $M?$\tablefootmark{a}\\
\hline \noalign{\smallskip}
Beuther et~al. (\cite{beut02}) & MAMBO -- IRAM-30~m & 69 & $>$$-20^{\circ}$ & 11 & Y & Y\tablefootmark{b} \\
Fa\'undez et~al. (\cite{faundez}) & SIMBA -- SEST-15~m & 146 & ${<}9^{\circ}$ & 24 & Y & Y \\
Hill et~al. (\cite{hill}) & SIMBA -- SEST-15 m & 404 & ${<}24^{\circ}$ & 24 & 20 K\tablefootmark{c} & Y \\
Rathborne et~al. (\cite{rath}) & MAMBO -- IRAM-30 m & 190 & $(-16^{\circ},+18^{\circ})$ & 11 & 15 K\tablefootmark{c} & Y \\
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{Y: quantities provided by the authors; N: quantities not provided by the authors;}
\tablefoottext{b}{masses recomputed according to the authors' Erratum (Beuther et~al. \cite{beuterr}) and assuming a dust opacity of 1~cm$^2$~g$^{-1}$ (Ossenkopf \& Henning \cite{ossenkopf});}
\tablefoottext{c}{dust temperature adopted by the authors to compute clump masses.}}
\vspace*{5mm}
\end{table}