\begin{table}%T1
%\centering
\small
\caption{Observational parameters of the data sets obtained with
KOSMA.  Columns one and two indicate the line and transition frequency,
followed by the number of points, the spacing (the data on a sampling
raster of 30$''$ were regridded on a 60$''$ raster), and half power
beam width (HPBW) in arcsec; $\eta_{\rm mb}$ is the main-beam
efficiency, $T_{\rm sys}$ the average system temperature, $\Delta
v_{\rm res}$ denotes the channel spacing, and $\Delta T_{\rm rms}$ the
average rms noise temperature (of the data on a 60$''$ grid) per
channel on a $T_{\rm mb}$ scale.}
\label{obst}
\begin{tabular}{ccccccccc}
\hline\hline
 & $\nu$ & \#Points & Grid & HPBW & $\eta_{\rm mb}$ & $\langle T_{\rm sys}\rangle$ &
 $\Delta v_{\rm res}$ & $\langle\Delta T_{\rm rms}\rangle$ \\
 & [GHz] & & & & & [K] & [km s$^{-1}$] & [K] \\
\hline
$^{13}$CO~ 3$\;\to\;$2 & 330.588 &  9834  & 60$''$ & 80$'' $ & 0.68 & 325 & 0.31 & 0.35 \\
$^{13}$CO~ 2$\;\to\;$1 & 220.399 & 37778  & 60$''$ & 130$''$ & 0.72 & 219 & 0.22 & 0.34 \\
$^{12}$CO~ 3$\;\to\;$2 & 345.796 & 21934  & 60$''$ & 80$'' $ & 0.68 & 346 & 0.29 & 0.38 \\
$^{12}$CO~ 2$\;\to\;$1 & 230.537 &    77  &        & 130$''$ & 0.72 & 222 & 0.21 & 0.09 \\
\hline
\end{tabular}
\end{table}