\begin{table}%tA.1
%\centering
\par
\caption{Comparison between the integrated photon absorption rates 
$\mathcal{R}$ (in s$^{-1}$) and the average absorbed energy 
$\mathcal{E}$ (in eV) computed using theoretical 
\citep[$\sigma_{\rm th}$,][]{mal04} and laboratory 
\citep[$\sigma_{\rm lab}$,][]{job92a,job92b} photo-absorption cross-sections for
anthracene, pyrene, coronene, and ovalene in the three RFs considered.
\label{rates_comparison}}
\begin{tabular}{ccccccc}
\hline 
\hline
\noalign{\smallskip}
& \multicolumn{6}{c}{Radiation field}\\
\noalign{\smallskip}
& \multicolumn{2}{c}{ISRF}& \multicolumn{2}{c}{Red Rectangle} 
& \multicolumn{2}{c}{IRAS~21282+5050}\\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
& $\mathcal{R}$ & $\mathcal{E}$ & $\mathcal{R}$ & $\mathcal{E}$ & 
$\mathcal{R}$ & $\mathcal{E}$\\
& (s$^{-1}$) & (eV) & (s$^{-1}$) & (eV) & (s$^{-1}$) & (eV) \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\multicolumn{7}{c}{Anthracene (C$_{14}$H$_{10}$)}\\[1mm]
%\noalign{\smallskip}
$\sigma_{\rm lab}$ & $6.0\times 10^{-8}$ & 7.6 & $1.1\times 10^{-6}$ & 5.1 & $5.9\times 10^{-3}$& 8.9 \\
$\sigma_{\rm th}$ & $6.4\times 10^{-8}$ & 6.8 & $2.5\times 10^{-6}$ & 4.0 & $5.2\times 10^{-3}$& 8.6\\
%\noalign{\smallskip}
\hline
\noalign{\smallskip}
\multicolumn{7}{c}{Pyrene (C$_{16}$H$_{10}$)}\\[1mm]
%\noalign{\smallskip}
$\sigma_{\rm lab}$ & $5.6\times 10^{-8}$ & 7.4 & $1.1\times 10^{-6}$ & 5.2 & $5.1\times 10^{-3}$ & 8.9\\
$\sigma_{\rm th}$ &  $8.1\times 10^{-8}$& 6.4 & $3.7\times 10^{-6}$ & 3.8 & $5.7\times 10^{-3}$& 8.6\\ 
%\noalign{\smallskip}
\hline\noalign{\smallskip}
%\noalign{\smallskip}
\multicolumn{7}{c}{Coronene (C$_{24}$H$_{12}$)}\\[1mm]
\noalign{\smallskip}
$\sigma_{\rm lab}$ &$ 1.4\times 10^{-7}$ & 6.8 & $3.9\times 10^{-6}$ & 4.5 & $1.1\times  10^{-2}$ & 8.6\\ 
$\sigma_{\rm th}$ & $1.3 \times 10^{-7}$& 6.2 &  $4.5\times 10^{-6}$ & 4.1 & $8.5\times 10^{-3}$ & 8.5\\
%\noalign{\smallskip}
\hline\noalign{\smallskip}
%\noalign{\smallskip}
\multicolumn{7}{c}{Ovalene (C$_{32}$H$_{14}$)}\\[1mm]
%\noalign{\smallskip}
$\sigma_{\rm lab}$ & $2.4\times 10^{-7}$ & 5.6 & $1.4\times 10^{-5}$ & 3.5 & $1.3\times 10^{-2}$ & 8.2\\
$\sigma_{\rm th}$ &  $2.8\times 10^{-7}$ & 4.6 &  $2.0\times 10^{-5}$ & 3.1 &  $1.1\times 10^{-2}$ & 8.2\\
\hline
\end{tabular}
\end{table}