\begin{table}%t3
\center%
\caption{\label{tab:porosity_evolution}Overview of the porosity evolution in the different collisional outcomes.}
\begin{tabular}{lll}
    \hline \hline
    Collisional outcomes & Porosity evolution & Equation \\
    \hline
    S1              & fluffier   & (\ref{eq:porosity_S1}) \\
    S2              & neutral or compaction   & (\ref{eq:porosity_S2a}) or (\ref{eq:porosity_S2b})\\
    S3              & compaction & (\ref{eq:S3_new_vol_porous}), (\ref{eq:S3_crater_volume}), (\ref{eq:porosity_S3})\\
    S4 (target)     & fluffier   & (\ref{eq:porosity_S2b}) \\
    S4 (projectile) & neutral    & -- \\
    B1              & compaction & (\ref{eq:weidling_ff_increase}) -- (\ref{eq:B1_phi_max_scale})\\
    B2 (target)     & neutral    & -- \\
    B2 (projectile) & both       & (\ref{eq:porosity_S2b})\tablefootmark{a} \\
    F1              & neutral    & -- \\
    F2              & neutral    & -- \\
    F3 (target)     & fluffier   & (\ref{eq:porosity_S2b})\tablefootmark{a} \\
    F3 (projectile) & neutral    & -- \\
    \hline
\end{tabular}
\tablefoot{
%{\tablefoottext{a}}
$^{(a)}$ The indices of target and projectile must be swapped here.}
\end{table}