\begin{table}%f6
\caption{\label{tab6}Radial velocities (see Sect.~4.2). Uncertainties in the frequencies are small relative to those of the velocities, 
which were obtained by Gaussian fits$^{a}$.}
\par
%\centerline
{
\begin{tabular}{cccc}
\hline \hline 
Species & Transition & Rest & $V_{\rm LSR}$  \\
&   & Frequency (GHz)  & (km~s$^{-1}$) \\
\hline
NH$_3$     &  ($J$,~$K$) = (1, 1)     & 23.694496  &    9.0~(0.1)  \\
              &                        &            &    8.6~(0.5)  \\
              &              (2, 2)     & 23.722633  &    7.4~(0.2)  \\
              &                        &            &   10.5~(0.4)  \\
              &              (3, 3)     & 23.870130  &    8.6~(0.1)  \\
              &              (4, 4)     & 24.139416  &    8.4~(0.2)  \\
              &                        &            &    9.1~(0.7)  \\
              &              (5, 5)     & 24.532989  &    8.2~(0.3)  \\
              &                        &            &    8.7~(0.5)  \\
              &              (6, 6)     & 25.056025  &    8.1~(0.2)  \\
              &                        &            &    8.5~(0.6)  \\
              &              (7, 7)     & 25.715182  &   10.9~(0.4)  \\
              &              (8, 9)     & 27.477943  &    8.8~(0.7)  \\
              &            (10, 10)     & 28.604737  &   10.2~(2.0)  \\
HC$_3$N       &  $J$ =  $ 3\leftarrow2$	 & 27.294289  &    9.0~(0.4)  \\
              &  	  $ 4\leftarrow3$  & 36.392324  &    8.2~(0.3)  \\
              &  	  $ 5\leftarrow4$  & 45.490314  &    8.0~(1.0)  \\
              &  	  $ 6\leftarrow5$  & 54.588247  &    7.7~(0.3)  \\
              &  	  $ 7\leftarrow6$  & 63.686052  &   10.0~(0.4)  \\
              &  	                   &            &	         \\
SiO           &  	  $ 1\leftarrow0$  & 43.423846  &    9.8~(0.7)  \\
SiO           &  	  $ 2\leftarrow1$  & 86.847010  &    8.9~(1.8)  \\
C$^{34}$S     &  	  $ 1\leftarrow0$  & 48.206946  &    9.8~(0.6)  \\
H$^{13}$CO$^+$&  	  $ 1\leftarrow0$  & 86.754288  &    9.7~(0.7)  \\
H$^{13}$CN    &  	  $ 1\leftarrow0$  & 86.339922  &    8.8~(1.5)  \\ 
HN$^{13}$C    &  	  $ 1\leftarrow0$  & 87.090873  &    7.4~(1.3)  \\ 
\hline
\end{tabular}}
\medskip
\par
$^a$ Frequencies were taken from the JPL catalog (NH$_3$), the Cologne
Database for Molecular Spectroscopy (HC$_3$N), and the line list of Lovas
(other species). NH$_3$ transitions with two $V_{\rm LSR}$ values were 
measured twice (see Henkel et~al.~\cite{henkel08}).
\end{table}