\begin{table}%t1
%\centering
\par
\caption{\label{Energies}Reaction rate coefficients, $R_{\rm react}$, and activation energy barriers for CO + H and H$_2$CO + H for different temperatures.}
\small \begin{tabular}{ccccc}
\hline\hline
$T$ & \multicolumn{2}{c}{CO + H} & \multicolumn{2}{c}{H$_2$CO + H}\\
& Barrier &  $R_{\rm react}$ & Barrier & $R_{\rm react}$ \\
(K) & (K) & (s$^{-1}$) &(K) & (s$^{-1}$)\\
\hline\noalign{\smallskip}
12.0 & $390 \pm 30$ & $2 \times 10^{-3}$ & $415 \pm 30$ & $2 \times 10^{-4}$ \\
13.5 & $435 \pm 40$ & $2 \times 10^{-3}$ & $435 \pm 40$ & $2 \times 10^{-3}$\\
15.0 & $480 \pm 50$&$3 \times 10^{-3}$ & $470 \pm 50$ & $5 \times 10^{-3}$ \\
16.5 & $520 \pm 60$ & $4 \times 10^{-3}$ &$490 \pm 60$ & $2 \times 10^{-2}$ \\
\hline
\end{tabular}
\end{table}