\begin{table}%t3
\caption{\label{ass:abundances}Modeling assumptions of the abundance stratification.}
\par
%\centering
\par
\begin{tabular}{lll}
\hline \hline \noalign{\smallskip}
Region & Variable & Comment \\
\hline
 $R < R_{\rm{inner}}$ & $f_0$(mol)  & not sensitive \\
 $R =R_{\rm{inner}}$ &$f_1$(mol)  &  $f_0$(mol) $\equiv$ $f_1$(mol) \\
 $R =R_{\rm{2}}$ & $f_2$(mol)  &  allow for depletion {\footnotesize{(e.g. due to dust}} \\
                                 &    $R_{\rm{2}}$                &  formation) or extra formation process \\
\multicolumn{1}{l}{$R_{\rm{inner}} < R < R_{\rm{2}}$} & & linear interpolation in $\log(R)-\log(f)$ \\
\multicolumn{1}{l}{$R > R_{\rm{2}}$}& & theor. pred. of Willacy scaled to $f_2$(mol) \\
\hline
\end{tabular}
\end{table}