\begin{table}%t3
\par
\caption{Physical properties of observed IRDCs.\label{tab:physical_parameters}}
%\centerline
{{\scriptsize
\begin{tabular}{ccrrrrcdddddc}
\hline
\hline
Source                        & Offsets       & $T_{\rm EX}$     & $T_{\rm ROT}$   & $T_{\rm KIN}$ & $N({\rm NH_3})$ & $N({\rm H+H_2})$ & \dlabel{$\chi_{\rm NH_3}$}  & \dlabel{Mass}  & \dlabel{Size} & \dlabel{$M_{\rm vir}$} & \dlabel{$\alpha$} & \dlabel{$M_{\rm NH_3 }$} \\
                              & [arcsecs]   & [K]    & [K] & [K]    & [$10^{14}~{\rm cm^-2}$]   &  \dlabel{[$10^{22}~{\rm cm^-2}$]} &  \dlabel{[$10^{-8}$]}   &\dlabel{$M_{\odot}$}    & \dlabel{[arcsecs]}& \dlabel{[$M_{\odot}$]} & \dlabel{}& [$10^4$~$M_{\odot}$] \\
\hline
G11.11$-$0.12  \AMM\ P1       & (80,40)       &   7.6 ($\pm$0.7) & 12.3 ($\pm$1.2) & 12.7 & 41.5 ($\pm$ 6.4)  &  8.4 & 4.9  & 485 & 27 & 468   & 1.0    & 18.1 \\
G11.11$-$0.12 \AMM\ P2        & (0,0)         &   6.6 ($\pm$0.4) & 13.4 ($\pm$1.0) & 13.8 & 30.5 ($\pm$ 3.3)  & 10.2 & 2.9  & 172 & 13 & 268   & 1.6    &   \\
G11.11$-$0.12 \AMM\ P3        & (-300,-325)   &   7.1 ($\pm$0.3) & 14.1 ($\pm$9.7) & 14.5 & 60.4 ($\pm$ 11.4) &  8.7 & 6.9  & 647 & 32 & 860   & 1.3    &    \\
G11.11$-$0.12 \AMM\ P4        & (-300,-400)   &   5.7 ($\pm$0.5) & 10.5 ($\pm$1.0) & 10.8 & 50.9 ($\pm$ 10.6) & 16.1 & 3.2  & 788 & 25 & 555   & 0.7    &      \\
G19.30$+$0.07 \AMM\ P1$^{n}$  & (20,20)       &   8.2 ($\pm$0.9) & 17.6 ($\pm$2.0) & 18.4 & 25.9 ($\pm$ 3.2)  &      &     &     & 38 & 893   &        & 0.9 \\
G19.30$+$0.07 \AMM\ P2 $^{n}$ & (-60,-20)     &   5.9 ($\pm$0.7) & 13.8 ($\pm$1.8) & 14.3 & 33.3 ($\pm$ 6.9)  &      &     &     & 45 & 823   &        &        \\
G24.72$-$0.17 \AMM\ P1 $^{n}$ & (150,220)     &   6.6 ($\pm$0.6) & 17.4 ($\pm$2.2) & 18.2 & 44.3 ($\pm$ 5.7)  &      &     &     & 34 & 2450  &        & 1.4 \\
G24.63$+$0.15$^{n}$           & (0,0)         &   5.0 ($\pm$0.5) & 14.3 ($\pm$1.4) & 14.8 & 24.1 ($\pm$ 4.4)  &      &     &     & 43 & 1358  &        & 0.7 \\
G28.34$+$0.06 \AMM\ P1        & (0,0)         &   5.7 ($\pm$0.2) & 16.0 ($\pm$1.2) & 16.6 & 32.1 ($\pm$ 2.2)  &  5.8 & 5.5  &904  & 22 & 2280  & 2.5    &  25.4 \\
G28.34$+$0.06 \AMM\ P2        & (20,200)      &   5.5 ($\pm$0.2) & 15.4 ($\pm$1.4) & 16.0 & 38.6 ($\pm$ 3.2)  & 32.7 & 1.2  &2310 & 45 & 2928  & 1.3    &  \\
G28.34$+$0.06 \AMM\ P3        & (-60,-60)     &   4.8 ($\pm$0.2) & 12.8 ($\pm$1.2) & 13.2 & 47.2 ($\pm$ 6.1)  &  5.9 & 8    &374  & 21 & 1398  & 3.7    &      \\
G28.34$+$0.06 \AMM\ P4        & (-30,50)      &   4.8 ($\pm$0.2) & 15.9 ($\pm$2.2) & 16.4 & 37.4 ($\pm$ 4.9)  &  3.7 & 10.1 &147  & 16 & 960   & 6.5    &   \\
G28.34$+$0.06 \AMM\ P5        & (50,40)       &   5.6 ($\pm$0.3) & 13.6 ($\pm$1.3) & 14.1 & 29.6 ($\pm$ 3.8)  &  6.3 & 4.7  &528  & 24 & 1378  & 2.6    &     \\
G33.71$-$0.01 \AMM\ P1 $^{n}$ & (-40,-200)    &   5.6 ($\pm$1.1) & 16.6 ($\pm$2.3) & 17.2 & 23.0 ($\pm$ 6.6)  &      &     &     & 52 & 7880  &        & 15.6 \\
G33.71$-$0.01 \AMM\ P2 $^{n}$ & (60,100)      &   5.3 ($\pm$0.3) & 17.1 ($\pm$2.0) & 17.8 & 29.0 ($\pm$ 3.3)  &      &     &     & 60 & 4928  &        &      \\
G79.27$+$0.38 \AMM\ P1        & (-20,0)       &   4.8 ($\pm$0.2) & 12.4 ($\pm$0.9) & 12.8 & 20.5 ($\pm$ 2.5)  & 14.2 & 1.4  & 84  & 32 & 155   & 1.8    & 0.4 \\
G79.27$+$0.38 \AMM\ P2        & (-140,40)     &   6.0 ($\pm$0.7) & 11.2 ($\pm$1.4) & 11.5 & 11.3 ($\pm$ 2.7)  & 12.1 & 0.9  & 55  & 25 & 53    & 1.0    &     \\
G79.27$+$0.38 \AMM\ P3        & (-250,70)     &   3.3 ($\pm$2.2) & 11.7 ($\pm$1.6) & 12.0 & 10.0 ($\pm$ 25.0) &  6.5 & 1.5  & 19  & 20 & 40    & 2.1    &         \\
G79.34$+$0.33 \AMM\ P1        & (0,0)         &   5.8 ($\pm$0.3) & 14.1 ($\pm$0.8) & 14.6 & 11.9 ($\pm$ 1.0)  & 17.5 & 0.7  & 143 & 39 & 178   & 1.2    & 0.2 \\
G81.50$+$0.14 $^{n}$          & (260,-375)    &   5.6 ($\pm$1)   & 14.9 ($\pm$1.3) & 15.4 &  7.6 ($\pm$ 2.0)  &      &     &     & 78 & 570   &       & 0.1 \\
\hline
\end{tabular}}}
\par
\smallskip
Notes: Columns are name, offset position from reference, excitation temperature, \AMM\ rotational temperature, kinetic temperature, \AMM\ column density,  $\rm H_2$ column density, \AMM\ abundance, gas mass estimated from SCUBA data, size of the cores, virial masses from \AMM~ the alpha parameter defined as in total cloud mass from \AMM . The formal errors are given in brackets. $^{n}$ are those sources for which the sizes
have been derived from \AMM\ data. The $\rm H_2$ column densities are estimated from 850 $\mu$m SCUBA map \citep{carey2000:irdc}. 
\par
\end{table}