\begin{table}%t2
\caption{Line parameters from single dish observations.}\label{tab2}
%\centerline
{
\begin{tabular}{llllll}\hline\hline
Molecule & Transition & $V({\rm core)}$$^{a}$ & $I({\rm core})$$^{b}$ & $V({\rm wing)}$$^{a}$ & $I({\rm wing})$$^{b}$ \\
          &               & km~s$^{-1}$       & K km~s$^{-1}$         & km~s$^{-1}$           & K km~s$^{-1}$         \\ \hline
$^{12}$CO & 2--1          & [4, 11]      & 45              & [11, 30]         & 13              \\
          & 3--2          & [4, 11]      & 50              & [11, 30]         & 24              \\
C$^{18}$O & 3--2          & Gaussian    & 1.7             & $\ldots$        & $\ldots$        \\
CH$_3$OH  & 7$_2$--6$_2$  & [6, 9]       & 2.0             & [9, 21]          & 6.4             \\
CS        & 2--1          & [5.5, 9.5]   & 12              & [9.5, 16]        & 3.9             \\
          & 7--6          & [5.5, 9.5]   & 1.6             & [9.5, 16]        & 1.6             \\
HCN       & 1--0$^{c}$    & [5.5, 7.5]   & 4.2             & [7.5, 15]        & 3.3             \\
          & 4--3          & [5.5, 7.5]   & 0.72            & [7.5, 15]        & 0.78            \\
HCO$^+$   & 1--0          & [5.5, 7.5]   & 8.4             & [7.5, 15]        & 6.5             \\
          & 4--3          & [5.5, 7.5]   & 2.7             & [7.5, 15]        & 2.0             \\
H$_2$CO   & $5_{1,5}-4_{1,4}$ & [5.5, 7.5]   & 3.1         & [7.5, 15]        & 1.5             \\
SiO       & 2--1          & $\ldots$    & $\ldots$        & [7, 29]          & 10.4            \\
          & 5--4          & $\ldots$    & $\ldots$        & [7.5, 20]        & 6.5             \\
          & 8--7          & $\ldots$    & $\ldots$        & [7.5, 28]        & 4.4             \\
SO        & $2_3-1_2$     & [5, 9]       & 4.3             & [9, 17]          & 4.2             \\
          & $8_9-7_8$     & [5, 9]       & 0.61            & [9, 17]          & 2.0             \\ \hline
\end{tabular}}
\medskip
Notes: $^{a}$Velocity interval over which the emission is
integrated. $^{b}$Integrated line intensity ($I=\int T_{\rm mb}~ {\rm
d}v$). $^{c}$Main hyperfine line; line intensities derived through
decomposition with HCO$^+$ line. See description in text.
\end{table}