\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}