\begin{table}%t1
\caption{\label{obs_lines}Observed lines.}            
%\centerline
{                     
\small\begin{tabular}{llrr}        
\hline\hline                 
Telescope & Transition 	& Rest Freq.    & $E_{\rm upper}$ 	\\    
	  &				& [GHz] 	& [K]	\\
\hline
PdBI     & H$^{13}$CO$^{+}$ 1 $\rightarrow$ 0 	& 86.754	& 4	\\%86.754330
PdBI     & SiO 2 $\rightarrow$ 1			& 86.847	& 6	\\%86.847010
PdBI     & HN$^{13}$C 1 $\rightarrow$ 0		& 87.091	& 4	\\%87.090859
SMA      & C$^{18}$O 2 $\rightarrow$ 1		& 219.560	& 16	\\%219.560353
SMA      & $^{13}$CO 2 $\rightarrow$ 1		& 220.399	& 16	\\%220.398681
SMA      & CH$_3$OH 8$_{-1}$ $\rightarrow$ 7$_0$ E	& 229.759	& 89	\\%229.758811
SMA, 30~m & CO 2 $\rightarrow$ 1			& 230.538	& 17	\\%230.538000
SMA      & N$_2$H$^+$ 3 $\rightarrow$ 2			& 279.512	& 27	\\%279.511732
SMA      & CH$_3$OH 6$_0$ $\rightarrow$ 5$_0$ E	& 289.939	& 62	\\%289.939386
SMA      & CH$_3$OH 6$_{-1}$ $\rightarrow$ 5$_{-1}$ E & 290.070	& 54	\\%290.069824
SMA      & CH$_3$OH 6$_{0}$ $\rightarrow$ 5$_{0}$ A	& 290.111	& 48	\\%290.110666
SMA      & CH$_3$OH 6$_{1}$ $\rightarrow$ 5$_{1}$ E	& 290.249	& 70	\\%290.248762
SMA      & CH$_3$OH 6$_{-2}$ $\rightarrow$ 5$_{-2}$ E & 290.307	& 75	\\%290.307294
%SO 6_5$\rightarrow$ 5_4 & 219.949433 & \\
\hline
\end{tabular}}
\end{table}