\begin{table}%t2
%\centering
\par
\caption{\label{eta_mb}Energies of the upper levels, $E_{\rm up}$, main-beam efficiencies, $\eta_{{\rm mb}}$, and main-beam FWHM:s, $\theta_{{\rm mb}}$, at the frequencies of the observed CO and SiO lines.}
\small \begin{tabular}{cccccc}
\hline\hline
Transition &Frequency  &$E_{\rm up}$ & $\eta_{\rm  mb}$ & $\theta_{\rm mb}$ &
 Telescope\\ 
& [GHz] & [K]  &&  [''] & \\
\hline
${\rm CO}(J=1\rightarrow0)$ & 115.271    & 5.5 & 0.43 & 33 &  {OSO} \\
${\rm CO}(J=1\rightarrow0)$ &115.271    & 5.5 & 0.74 & 22 &   {IRAM} \\
${\rm CO}(J=2\rightarrow1)$ & 230.538    & 16.6 & 0.52 & 11 & {IRAM} \\
${\rm CO}(J=3\rightarrow2)$ & 345.796    & 33.2 & 0.56 & 14 & {JCMT} \\	             
${\rm CO}(J=3\rightarrow2)$ & 345.796    & 33.2 & 0.70 & 18 & {APEX} \\
${\rm SiO}(J=2\rightarrow1)$ &86.847  & 6.3 & 0.65 & 44 &      {OSO} \\
${\rm SiO}(J=2\rightarrow1)$ & 86.847  & 6.3 & 0.78 & 29 &     {IRAM} \\
${\rm SiO}(J=5\rightarrow4)$ & 217.105    & 31.3 & 0.57 & 12 & {IRAM} \\
${\rm SiO}(J=6\rightarrow5)$ & 260.518    & 43.8 & 0.69 & 21 & {JCMT} \\
${\rm SiO}(J=8\rightarrow7)$ & 347.331    & 75.0 & 0.63 & 14 & {JCMT} \\	             
${\rm SiO}(J=8\rightarrow7)$ & 347.331    & 75.0 & 0.70 & 18 & {APEX} \\
\hline
\end{tabular}
\end{table}