\begin{table}%t2
  \caption{\label{tab:pars}List of the model runs. }
 %\centerline
 {  \begin{tabular}{lllll}
    \hline
    \hline
    id            & Density           & Type        & Grain size      & 
    Figure Ref.\\
                  & $n$ [cm$^{-3}$]   &             & $a_0$ [$\micr$] &           \\
    (1)           & (2)               & (3)         & (4)             & (5)       \\
    \hline
    1             & $10^3$            & ice               & $0.1  $         &           \\
    2             & $10^4$            & silicates         & $0.1  $         & \fg{pstudy}          \\
    3             & $10^4$            & ice               & $0.1  $         &  \fg{pstudy}         \\
    4             & $10^5$            & silicates         & $0.1  $         & \fg{pstudy}          \\
    5             & $10^5$            & silicates         & $1    $         &           \\
    6$^a$         & $10^5$            & ice               & $0.1  $         & 
    Figs.~\ref{fig:default}, \ref{fig:defstats}, \ref{fig:por-analys} \\
    7             & $10^5$            & ice               & $1    $         & \fg{a0s}          \\
    8             & $10^5$            & ice               & $0.03 $         & \fg{a0s}          \\
    9             & $10^5$            & ice, compact$^b$ & $0.1  $         & \fg{recip} \\
    10            & $10^5$            & ice, head-on$^c$ & $0.1  $         & 
    Figs.~\ref{fig:defstats}, \ref{fig:recip}\\
    11            & $10^6$            & silicates         & $0.1  $         & \fg{pstudy}          \\
    12            & $10^6$            & ice               & $0.1  $         & \fg{pstudy}         \\
    13            & $10^7$            & ice               & $0.1  $         & \\
    \hline
  \end{tabular}}
\par
  \smallskip
  {{Note:} (1) Model number. (2) Number density of the gas. (3) Collision type, describing material parameters and collision setup.  Here, 
  ``ice'' refers to ice-coated silicates of bulk density identical to bare silicates, $\rho_{\rm s} = 2.65~ {\rm g~ cm^{-3}}$, but different material properties: $\gamma=370~ {\rm erg~ cm^{-2}}$ and $\mathcal{E}^\star=3.7\times10^{10}~ {\rm dyn~ cm^{-2}}$. For bare silicates, $\gamma=25\ {\rm erg\ cm^{-2}}$ and $\mathcal{E}^\star = 2.8\times10^{11}~ {\rm dyn~ cm^{-2}}$. (4) Monomer radius. (5) Figure reference. $^{a}$ The standard model; $^b$ filling factor of particles restricted to a minimum of~33\%; $^c$ central impact collisions only ($b=0$).}
\end{table}