\begin{table}%t1
\caption{Desorption energies of selected species.}\label{tab1}
%\centering
\small
\begin{tabular}{l c}
\hline\hline
Species & $E_{\rm D}$ (K) \\
\hline
H & 450 \\
H$_2$ & 430 \\
OH & 2850 \\
H$_2$O & 5700 \\
N$_2$ & 1000 \\
CO & 1150 \\
CH$_4$ & 1300 \\
HCO & 1600 \\
H$_2$CO  & 2050 \\
CH$_3$O  & 5080 \\
CH$_3$OH  & 5530 \\
HCOOH & 5570 \\
HCOOCH$_3$ & 6300 \\
CH$_3$OCH$_3$ & 3150 \\
\hline
\end{tabular}
\end{table}