\begin{table}%t8
\caption{Source properties derived from (sub-)mm continuum emission: deconvolved angular 
diameter ($\theta_{\rm cont}$), integrated 850~$\mu$m continuum flux ($F_{\nu}$, 
for \dcd\ we give the integrated 1.2~mm continuum flux), linear size ($D$), 
gas+dust mass ($M_{\rm cont}$), visual extinction ($A_{\rm v}$) and
H$_{2}$ column and volume densities ($N_{\rm H_2}$ and $n_{\rm H_2}$), 
derived from $M_{\rm cont}$ and $A_{\rm v}$.}
\label{tab_dust}
%\centerline
{
\small
\begin{tabular}{cccccccccc}
\hline \hline\\[-3mm]
source & $\theta_{\rm cont}$ & $D$ & $F_{\nu}$ & $M_{\rm cont}$ & $A_{\rm v}$  & $N_{\rm H_2}^{\dagger}$ & $N_{\rm H_2}^{\dagger\dagger}$ & 
$n_{\rm H_2}^{\dagger}$ & $n_{\rm H_2}^{\dagger\dagger}$ \\
       & (arcsec) & (pc) & (Jy) & (\solm )  &  (mag) & ($\times 10^{23}$~\cmq ) & ($\times 10^{23}$~\cmq ) & ($\times 10^{5}$~\cmc ) & ($\times 10^{5}$~\cmc ) \\
\hline
05345+3157  &	   21.4  & 0.19 &  4.42   &  179  &  220 &  6.26 & 2.07 & 10.9 & 3.6 \\
05373+2349  &	     14  & 0.08 &  2.87  &    35 &  239  &  6.81 & 2.25 & 27.8 & 9.3 \\
18144$-$1723  &	   14.8  &  0.31 &  7.76  &    1118 &  496  &   14.1 & 4.67 & 14.8 & 4.9 \\
18511+0146  &	   29.3  &  0.55 & 10.23  &    959 &  137  &  3.89 & 1.29 & 2.3 & 0.8 \\
18517+0437  &	     29  &  0.41 & 7.2$^{{\bf 1}}$  &  336  &  87  & 2.47 & 0.8 & 2.0 & 0.6 \\
19092+0841  &	   11.7  & 0.25 &  5.57  &   426 &  283  &  8.05 & 2.7 & 10.3 & 3.4 \\
20126+4104  &	     18  & 0.15 &  21.9$^{{\bf 2}}$  &   504 &  982  &  28.0 & 9.2 & 61.2 & 20.2 \\
20216+4107  &	   22.7  & 0.19 &  6.1$^{{\bf 2}}$  &    160 &  196   &  5.58 & 1.84 & 9.7 & 3.2 \\
20343+4129  &	     26  &  0.18 &  19$^{{\bf 2}}$  &    426 &   586 &  16.7 & 5.51 & 30.7 & 10.3 \\
22172+5549  &	   15.7  &  0.18 &  3.47   &   239 &   307   &  8.73 & 2.88 & 15.5 & 5.2 \\
\hline
\end{tabular}
}
$^{1}$  From Beuther et~al.~(\cite{beuther}), derived from the 1.2~mm continuum.
$^{2}$  From Williams et~al.~(\cite{williams}).
$^\dagger$  From $M_{\rm cont}$.
$^{\dagger\dagger}$  From $A_{\rm v}$.
\end{table}