\begin{table}%t3
\small\caption{\DAMM\ and \AMM\ column densities, rotational temperature and fractionation.}\label{tab:nh2d_ratio}
%\centerline
{\begin{tabular}{lccll}
\hline\hline\noalign{\smallskip}
Source   & $T_{\rm rot}$ $^{a}$  & $N_{\rm NH_3}$ $^{b}$& $N_{\rm NH_2D}$  $^{c}$& [\DAMM/\AMM]$^{d}$\\
\noalign{\smallskip}
&  K& $10^{15} \left(10^{14}\right)~\rm cm^{-2}$ & $10^{13}~\rm cm^{-2}$  &\\
\noalign{\smallskip}\hline
G8.13+0.25    & 18.0    (3.0)   &       1.8     (0.4)  &   1.7   (0.1) &         1.0   (0.2) \\  
              & 17.4    (2.3)   &       1.6     (0.3)  &   2.4   (0.1) &         1.5   (0.3) \\ 
G8.68-0.37    & 12.1    (0.8)   &       1.3     (0.1)  &   39.4  (12.4) &         30.3  (9.8) \\ 
G8.71-0.37    & 13.3    (1.0)   &       1.5     (0.2)  &   59.7  (10.6) &         39.8  (8.9) \\ 
G10.21-0.31   & 15.4    (1.5)   &       2.1     (0.3)  &   70.9  (29.9) &         33.7  (15.0) \\ 
G10.21-0.32   & 14.1    (0.7)   &       2.1     (0.1)  &   51.3  (22.3) &         24.4  (10.7) \\ 
G10.61-0.33   & 17.8    (1.5)   &       2.3     (0.2)  &   1.0   (0.1 ) &         0.4   (0.1) \\ 
G11.11-0.12P1 & 12.5    (1.2)   &       1.4     (0.2)  &   54.0  (23.5) &         38.6  (17.7) \\ 
G11.11-0.12P4 & 10.6    (1.6)   &       1.8     (0.5)  &   1.7   (0.3 ) &         0.9   (0.3) \\ 
G12.19-0.12   & 12.6    (0.3)   &       4.4     (0.2)  &   5.6   (0.2 ) &         1.3   (0.1) \\ 
G13.18+0.06   & 17.4    (1.3)   &       2.8     (0.2)  &   88.9  (23.2) &         31.7  (8.6) \\ 
G18.17-0.30   & 15.8    (1.2)   &       1.8     (0.2)  &   119.7 (31.5) &         66.5  (19.0) \\ 
G18.21-0.34   & 15.5    (1.2)   &       1.7     (0.2)  &   47.3  (19.7) &         27.8  (12.0) \\ 
G23.41-0.23   & 18.8    (1.8)   &       2.5     (0.3)  &   77.7  (51.3) &         31.1  (20.8) \\ 
G23.44-0.18   & 23.3    (1.5)   &       5.2     (0.4)  &   5.0   (0.2 ) &         1.0   (0.1) \\ 
G27.29+0.15   & 17.8    (1.7)   &       3.0     (0.3)  &   1.4   (0.2 ) &         0.5   (0.1) \\ 
G28.34+0.06P2 & 15.7    (2.0)   &       2.2     (0.3)  &   4.1   (0.2 ) &         1.9   (0.3) \\ 
G29.97-0.05   & 13.7    (1.4)   &       2.2     (0.3)  &   67.7  (15.2) &         30.8  (8.1) \\ 
G33.71-0.01   & 19.5    (4.6)   &       3.0     (0.8)  &   1.4   (0.1 ) &         0.5   (0.1) \\ 
G34.81-0.28   & 16.6    (1.0)   &       1.6     (0.1)  &   2.7   (0.2 ) &         1.7   (0.2) \\ 
G35.19-1.73   & 17.0    (0.9)   &       1.8     (0.1)  &   74.0  (11.0) &         41.1  (6.5) \\ 
G79.34+0.33   & 13.7    (1.0)   &       1.4     (0.1)  &   17.9  (15.9) &         12.8  (11.4) \\ 
G81.74+0.59   & 18.4    (1.1)   &       2.7     (0.2)  &   92.9  (17.6) &         34.4  (7.0) \\ 
\hline
\end{tabular}}
\smallskip
$^{a}$ Rotational temperature derived from \AMM\ observations. $^{b}$ \AMM\ column density.  $^{c}$~\DAMM\ column density. $^{d}$ Ratio of \AMM\ and \DAMM\ column densities in percentage. Note: similar notations are used for other molecules elsewhere in this paper.
\end{table}