\begin{table}%T1
\par
  \caption{CO~rotational line profiles as used in this
    study. Consecutive columns list the transition,  the
    telescope, the half-power beamwidth ({\it HPBW}), the main-beam
    efficiency~($\eta_{\rm{MB}}$), the 
    absolute flux uncertainty~($\sigma_{\rm{abs}}$), and the literature
    reference. The beam width, main-beam efficiency, and absolute flux
    uncertainty listed in this table are the ones as found in the cited
    paper. In case the absolute flux uncertainty was not given, an
    uncertainty of 20\% is assumed. }
\label{table_CO_rot}
\small%\centerline
{
\begin{tabular}{llllll}
\hline \hline 
Transition & Telescope & {\it HPBW} & $\eta_{\rm{MB}}$ & $\sigma_{\rm{abs}}$
& Literature  \\ 
 & & &  & & reference \\
\hline \noalign{\smallskip}
CO(1$-$0) & IRAM & 23\arcsec & 0.79 & 20\%$^{a}$ & D.~Teyssier \emph{(priv.\ comm.)} \\
CO(2$-$1) & JCMT & 19.7\arcsec & 0.69 & 20\% & this paper \\
CO(2$-$1) & IRAM & 13\arcsec & 0.60 & 20\%$^{a}$ & D.~Teyssier \emph{(priv.\ comm.)} \\
CO(2$-$1) & SEST & 23\arcsec & 0.50 & 20\%$^{a}$ & \citet{Winters2003AandA...409..715W} \\
CO(2$-$1) & NRAO & 25\arcsec & 0.33$^{b}$ & 30\% &\citet{Wannier1986ApJ...311..335W} \\
CO(2$-$1) & CSO & 30\arcsec &  0.76 &  20\%$^{a}$&
\citet{Knapp1998ApJS..117..209K} \\
CO(3$-$2) & JCMT & 13.2\arcsec & 0.63 & 20\% & this paper \\
CO(3$-$2) & CSO & 20\arcsec & 0.65 &  20\%$^{a}$& \citet{Knapp1998ApJS..117..209K} \\
CO(3$-$2) & CSO & 21\arcsec & 0.65 & 20\% & \citet{Teyssier2006AandA...450..167T} \\
CO(6$-$5) & CSO & 12\arcsec & 0.55 & 30\% & \citet{Teyssier2006AandA...450..167T} \\
\hline 
\end{tabular}}
\smallskip
$^{a}$ Assumed, $^{b}$ taken from \citet{Huggins1986ApJ...304..418H}.
\end{table}