\begin{table}%t2
%\begin{center}
\par
\caption{\label{lines}Observed lines.}
\begin{tabular}{lrr}
\hline \hline
\noalign{\smallskip}
Line & $\lambda$ & $E_{\rm{lower}}/k$ \\
     & $\mu$m    & K \\
\hline
$^{12}$CO\\
R(9) & 4.5876 & 249 \\
R(8) & 4.5950 & 199 \\
R(7) & 4.6024 & 155 \\
R(6) & 4.6090 & 116 \\
R(5) & 4.6176 & 83  \\
R(4) & 4.6254 & 55  \\
R(3) & 4.6333 & 33  \\
R(2) & 4.6412 & 17  \\  
R(1) & 4.6493 & 5.5 \\
R(0) & 4.6575 & 0 \\
P(1) & 4.6742 & 5.5 \\
P(2) & 4.6826 & 17 \\
P(3) & 4.6912 & 33 \\
P(4) & 4.7000 & 55 \\
P(5) & 4.7088 & 83 \\
\hline
$^{13}$CO\\
R(13) & 4.6641 & 504 \\	
R(12) & 4.6741 & 432 \\ 
R(11) & 4.6782 & 365 \\ 
R(10) & 4.6853 & 304 \\ 
R(9)  & 4.6926 & 249 \\ 
R(8)  & 4.7000 & 199 \\ 
R(7)  & 4.7075 & 155 \\ 
R(6)  & 4.7150 & 116 \\
\hline
Pfund~$\beta$ & 4.6538 & $15~7954^a$\\
H$_2~0{-}0$~S9 & 4.6947 & 7198$^a$ \\
\hline  
\end{tabular}
%\end{center}
\par
\tablefoot 
{\tablefoottext{a} {The temperatures listed for the Pfund~$\beta$ and H$_2~0-0$~S9 lines do not indicate gas temperatures since these lines are not excited by collisions within thermal gas, but rather by ionizing photons and within shocked regions, respectively.}}%\vspace{-3mm}
\end{table}