\begin{table}%tA.4
\small \caption{\CO\ ($J=1$--0) and ($J=2$--1) line parameters.}\label{tab:c18o_line_parameter}
%\centerline
{\begin{tabular}{lcc}
\hline\hline\noalign{\smallskip}
& \multicolumn{1}{c}{ \CO\  ($J=1$--0)} & \multicolumn{1}{c}{\CO\  ($J=2$--1) } \\
Source  & \multicolumn{1}{c}{\tdv}    & \multicolumn{1}{c}{\tdv}   \\
\hline\noalign{\smallskip}
& \multicolumn{1}{c}{K~\kms}  & \multicolumn{1}{c}{K~\kms}  \\
\hline
G8.13+0.25                & 15.7  (0.1) & 27.6  (0.5)           \\
G8.68-0.37                & 24.9  (0.9) & 31.9  (1.7)           \\
G8.71-0.37                & 13.5  (0.4) &  5.9  (0.7)           \\
G10.15-0.34               & 15.6  (0.3) & 37.4  (0.5)           \\
G10.21-0.31               & 14.9  (0.2) & 19.0  (0.4)           \\
G10.21-0.32               & 27.5  (0.3) & 33.2  (0.6)           \\
G10.61-0.33               & 10.6  (0.3) & 14.7  (0.5)           \\
G11.11-0.12P1             & 6.1   (0.1) &  5.5  (0.4)           \\
G11.11-0.12P3             & 5.1   (0.3) &  5.1  (0.5)           \\
G11.11-0.12P4             & 5.1   (0.2) &  4.8  (0.5)           \\
G12.19-0.12               & 12.0  (0.2) & 20.8  (0.4)           \\
G13.18+0.06               & 9.7   (0.5) & 20.9  (0.8)           \\
G15.01-0.67               & 31.0  (0.2) & 91.7  (1.0)           \\
G15.01-0.69               & 16.2  (0.2) & 53.7  (0.5)           \\
G15.03-0.65               & 19.8  (0.2) & 65.5  (0.6)           \\
G18.17-0.30               & 13.1  (0.7) & 26.5  (1.3)           \\
G18.21-0.34               & 7.3   (0.4) & 12.0  (1.3)           \\     
G19.30+0.07P1$^a$   & 1.1   (0.4) &  --         \\
G19.30+0.07P2   & 4.1   (0.4) &  6.6  (0.7)           \\
G23.41-0.23     & 35.2  (0.8) & 44.5  (1.0)           \\
G23.42-0.23     & 31.5  (0.3) & 43.1  (0.5)           \\
G23.44-0.18     & 31.1  (0.5) & 43.4  (0.6)           \\
G27.29+0.15     & 12.4  (0.2) & 16.6  (0.5)           \\
G27.31+0.18     & 4.9   (0.2) &  6.1  (0.5)           \\
G28.34+0.06P1   & 11.3  (0.4) &  6.3  (1.5)           \\
G28.34+0.06P2   & 14.4  (0.5) & 19.1  (0.7)           \\
G29.97-0.05     & 12.9  (0.7) & 18.2  (0.9)           \\
G33.71-0.01     & 7.4   (0.2) &  9.0  (1.3)           \\
G34.81-0.28     & 5.4   (0.3) &  6.6  (0.6)           \\
G35.19-1.73     & 8.4   (0.2) & 15.8  (0.8)           \\
G79.34+0.33     & 7.8   (0.1) &  9.9  (0.2)           \\
G81.74+0.59     & 14.9  (0.2) & 32.4  (0.4)           \\        
\hline
\end{tabular}}
\smallskip
\tdv\ is the integrated intensity over $\pm$5~\kms of the brightest \CO\ ($J=1$--0) peak. $^{a}$ \CO\ ($J=2$--1) data suffered from baseline ripples.
\end{table}