\begin{table}%t1
\caption{\label{obs-table} Observing parameters of the molecular line data obtained with the 
FCRAO and IRAM 30~m telescope.}
%\centerline
{\small
\par
\begin{tabular}{lcccccccc}
\hline \hline 
 & $\nu$ & {\it HPBW} & $\eta_{\rm mb}$ & $T_{\rm sys}$ & $\Delta v_{\rm res}$ & $\Delta T_{\rm rms}$ \\
 & [GHz] & & & [K] & [km s$^{-1}$] & [K] \\
\hline 
FCRAO & & & & & & \\
$^{13}$CO       $1\to0$ & 110.2  & 45$''$ & 0.48 & 210 & 0.067  & 0.48 \\
CS              $2\to1$ &  98.0  & 48$''$ & 0.48 & 200 & 0.075  & 0.38 \\
N$_2$H$^+$      $1\to0$ &  93.2  & 48$''$ & 0.48 & 200 & 0.079  & 0.38 \\
\hline                                               
IRAM & & & & & & \\
$^{12}$CO       $2\to1$ & 230.8  & 11$''$ & 0.52 & 601 & 0.05  & 0.8 \\
H$_2$CO  \tiny{3(1,2)--2(1,1)} & 225.7  & 11$''$ & 0.55 & 549 & 0.05  & 0.65 \\
$^{13}$CO       $2\to1$ & 220.4  & 11$''$ & 0.57 & 580 & 0.03  & 0.9 \\
C$^{34}$S       $2\to1$ &  96.4  & 26$''$ & 0.77 & 210 & 0.025 & 0.5 \\
N$_2$H$^+$      $1\to0$ &  93.2  & 26$''$ & 0.77 & 158 & 0.03  & 0.1 \\
HCO$^+$         $1\to0$ &  89.2  & 28$''$ & 0.77 & 138 & 0.05  & 0.2 \\
H$^{13}$CO$^+$  $1\to0$ &  86.8  & 29$''$ & 0.78 & 114 & 0.025 & 0.25 \\
%N$_2$D$^+$    & $3\to2$ &  93.176  & 4497  & 5$''$  & $''$ & 0.77 & 158 & 0.03  & 0.1 \\
\hline
\end{tabular}}
\tablefoot{Column one and two indicate the molecular transition and frequency,
followed by the half power beam width ({\it HPBW}) in arcsec, $\eta_{\rm
mb}$ is the main beam efficiency, $T_{\rm sys}$ the system
temperature, $\Delta v_{\rm res}$ denotes the velocity
resolution, and $\Delta T_{\rm rms}$ the average rms noise temperature
per channel on a $T_{\rm mb}$ scale.}
\end{table}