\begin{table}%t3
%\centering
\par
\small\caption{Values of non-dissociative single ionization (photoionization) cross section,
$\sigma_{\rm ph-i}$, and dissociative ionization (photodissociation) cross section,
$\sigma_{\rm ph-d}$, of CH$_3$OH as a function of photon energy. The estimated experimental
error was 30\%. The photoabsorption cross section ($\sigma_{\rm ph-abs}$) from Ishii \&
Hitchcook (1988) is also shown.}\label{tab-sigma}
\begin{tabular}{ l l c c c }
\hline \hline\noalign{\smallskip}
Photon       &  & \multicolumn{3}{c}{Cross sections (cm$^{2}$)}\\
\cline{3-5}  energy (eV)  &  & $\sigma_{\rm ph-d}$ & $\sigma_{\rm ph-i}$    & $\sigma_{\rm ph-abs}$ \\
\hline\noalign{\smallskip}
275&& $1.1\times 10^{-19}$ &$2.0\times 10^{-20}$& $1.3\times 10^{-19}$ \\
280&& $1.2\times 10^{-19}$ &$1.9\times 10^{-20}$& $1.4\times 10^{-19}$ \\
285&& $7.1\times 10^{-19}$ &$1.1\times 10^{-19}$& $8.2\times 10^{-19}$ \\
286&& $4.1\times 10^{-18}$ &$5.8\times 10^{-19}$& $4.6\times 10^{-18}$ \\
287&& $2.9\times 10^{-17}$ &$4.6\times 10^{-18}$& $3.4\times 10^{-17}$ \\
288&& $1.3\times 10^{-16}$ &$2.1\times 10^{-17}$& $1.5\times 10^{-16}$ \\
289&& $2.6\times 10^{-16}$ &$4.3\times 10^{-17}$& $3.1\times 10^{-16}$ \\
290&& $1.8\times 10^{-16}$ &$2.9\times 10^{-17}$& $2.1\times 10^{-16}$ \\
291&& $1.9\times 10^{-16}$ &$2.9\times 10^{-17}$& $2.2\times 10^{-16}$ \\
292&& $1.9\times 10^{-16}$ &$3.0\times 10^{-17}$& $2.1\times 10^{-16}$ \\
293&& $1.9\times 10^{-16}$ &$2.8\times 10^{-17}$& $2.2\times 10^{-16}$ \\
300&& $1.1\times 10^{-16}$ &$1.5\times 10^{-17}$& $1.2\times 10^{-16}$ \\
310&& $8.7\times 10^{-17}$ &$9.9\times 10^{-18}$& $9.7\times 10^{-17}$ \\
\hline
\end{tabular}
\end{table}