\begin{table}%t6
\small\caption{\htcn\ and \hcfn\ line parameters and column density.}
%\centerline
{\begin{tabular}{lccccccc}
\hline\hline\noalign{\smallskip}
&   \multicolumn{4}{c}{\htcn\  $J=1$--0, $F=2$--1} &  \multicolumn{3}{c}{\hcfn\   $J=1$--0}  \\
 Source  & \multicolumn{1}{c}{\tdv$^{a}$} & \multicolumn{1}{c}{$\Delta v$} & \multicolumn{1}{c}{$T_{\rm rot}$} & \multicolumn{1}{c}{$N_{\rm H^{13}CN}$} & \multicolumn{1}{c}{\tdv} & \multicolumn{1}{c}{$\Delta v$} & \multicolumn{1}{c}{$N_{\rm HC^{15}N}$}\\
\noalign{\smallskip}\hline\noalign{\smallskip}
 & \multicolumn{1}{c}{K~\kms} & \multicolumn{1}{c}{\kms} & \multicolumn{1}{c}{K} & \multicolumn{1}{c}{$10^{12}~\rm cm^{-2}$} & \multicolumn{1}{c}{K~\kms} & \multicolumn{1}{c}{\kms} & \multicolumn{1}{c}{$10^{12}~\rm cm^{-2}$} \\
\hline
G10.21-0.31     &   0.9 (0.1)      & 3.5      & 15.4  (1.5)   &  12.2   (1.1) & 0.2     ($<$0.1)  & 1.2     (0.4)     &  0.5    (0.1)     \\
G10.21-0.32     &   0.7 (0.1)      & 2.4      & 14.5  (1.7)   &  9.3    (1.0) & 0.6     (0.2)     & 5.6     (2.2)     &  1.3    (0.6)     \\
G13.18+0.06     &   3.0 (0.1)      & 3.7      & 17.4  (1.3)   &  42.7   (2.5) & 0.7     (0.1)     & 3.3     (0.4)     &  1.9    (0.2)     \\
G15.01-0.67     &   7.3 (0.2)      & 3.4      & 24.3  (1.5)   &  129.5  (7.1) & 2.6     (0.2)     & 2.8     (0.3)     &  8.6    (0.9)     \\
G15.01-0.69     &   4.8 (0.2)      & 2.7      & 24.3  (1.3)   &  85.2   (4.3) & 1.6     (0.1)     & 2.4     (0.2)     &  5.3    (0.4)     \\
G15.03-0.65     &   3.6 (0.1)      & 3.6      & 20.4  (2.4)   &  55.9   (4.9) & 1.3     (0.1)     & 3.6     (0.0)     &  4.4    (1.0)     \\
                &   1.6 (0.1)      & 1.7      & 16.6  (2.9)   &  21.6   (2.6) & 0.3     (0.1)     & 1.7     (0.0)     &  0.9    (0.2)     \\ 
G23.41-0.23     &   1.3 (0.1)      & 2.0      & 18.8  (1.8)   &  18.6   (1.4) & 0.5     (0.1)     & 2.6     (0.5)     &  1.3    (0.2)     \\
G23.42-0.23     &   1.4 (0.1)      & 3.4      & 19.0  (2.0)   &  20.3   (1.7) & 0.4     (0.1)     & 2.6     (0.4)     &  1.1    (0.2)     \\
G28.34+0.06P2   &   1.0 (0.1)      & 2.4      & 15.7  (2.0)   &  13.8   (1.2) & 0.7     (0.1)     & 3.7     (0.5)     &  1.8    (0.2)     \\
G35.19-1.73     &   1.9 (0.1)      & 2.4      & 17.0  (0.9)   &  27.1   (1.3) & 0.6     (0.1)     & 2.0     (0.3)     &  1.4    (0.2)     \\
G79.34+0.33     &   0.8 ($<$0.1)   & 1.5      & 13.7  (1.0)   &  10.0   (0.5) & 0.2     ($<$0.1)  & 1.2     (0.2)     &  0.5    (0.1)     \\
G81.74+0.59     &   3.2 (0.1)      & 2.8      & 18.4  (1.1)   &  46.7   (2.3) & 1.1     (0.1)     & 2.8     (0.2)     &  3.0    (0.2)     \\
\hline
\end{tabular}}\smallskip
\label{tab:h13cn_line parameter}
$^a$ Integrated line intensity for the \htcn\ main group alone. 
\end{table}