\begin{table}%t3
\caption{\label{tab:oxygen}Atomic and molecular data for the oxygen and carbon fine structure lines and the CO rotational lines.}
%\centering
 \tiny 
\begin{tabular}{lllllll}
\hline\hline\noalign{\smallskip}
\multicolumn{3}{c}{Line identification} & $E_u$  & $E_l$  & $A_{ul}$  & $n_{\rm crit}$\\
 &  [$\mu$m] &  & [K] & [K]  & [s$^{-1}$] & [cm$^{-3}$]\\
\hline\noalign{\smallskip}
O~{\sc i} & 63.2   & $^3{\rm P}_1$ -- $^3{\rm P}_2$  &  227.7 & 0.0 & 8.865(--5) & 5(5)\\
O~{\sc i} & 44.1   & $^3{\rm P}_0$ -- $^3{\rm P}_2$  & 326.6 & 0.0 & 1.275(--10) & 0.5 \\
O~{\sc i} & 145.5  &  $^3{\rm P}_0$ -- $^3{\rm P}_1$ & 326.6 & 227.7 & 1.772(--5) & 6(4)\\
C~{\sc ii} & 157.7  & $^2{\rm P}_\frac{3}{2}$ -- $^2{\rm P}_\frac{1}{2}$ & 91.2 & 0.0 & 2.300(--6) & 3(3)\\
\noalign{\smallskip}\hline\hline\noalign{\smallskip}
\multicolumn{3}{c}{Line identification} & $E_u$  & $E_l$  & $A_{ul}$  & $n_{\rm crit}$\\
 &  [GHz] &  & [K] & [K]  & [s$^{-1}$] & [cm$^{-3}$]\\
\hline\noalign{\smallskip}
CO & 115. 3 & $J = 1$--0 & 5.53 & 0.0 & 7.203(--8) & \tablefootmark{1} 5.0(3) $T_{\rm g}^{-0.66}$ \\
CO & 230.5  & $J = 2$--1 & 16.60 & 5.53 & 6.910(--7) & \tablefootmark{1} 1.9(4) $T_{\rm g}^{-0.45}$\\
CO & 345.8  & $J = 3$--2 & 33.19 & 16.60 & 2.497(--6) &\tablefootmark{1} 4.6(4) $T_{\rm g}^{-0.35}$\\
\noalign{\smallskip}\hline
\end{tabular}
\tablefoot{\tablefoottext{1}{CO critical densities from \citet{Kamp2001}.
The notation 5(5) stands for $5\times 10^5$. Oxygen levels~2, 1, 0 correspond to $^3{\rm P}_2$, $^3{\rm P}_1$, and  $^3{\rm P}_0$, respectively.}}
\end{table}