\begin{table}%t1
%\centering
\par
\caption{Molecular properties of the (hydro)carbon species taking part in the grain growth process. From the left the columns give: the $i,m$ used in the growth rates; the molecule species; the atomic weight; the (constant) sticking coefficient (Eq.~(\ref{eq:phDrstick}); these are the same numbers used for $\alpha_i$ and $\alpha^{{\rm c}}_{i,m}$ in Eqs.~(\ref{eq:phPCgrh}--\ref{eq:phPCspc})); the binding energy for each species to a sp$^3$ carbon surface; and the corresponding source of binding energies in the literature.\label{tab:phDrgrgr}}
\begin{tabular}{llrrll}\hline\hline\\[-1.8ex]
$i,m$ & mol\@. & \multicolumn{1}{c}{$A$} & \multicolumn{1}{c}{$\alpha_{{\rm C}}$} & \multicolumn{1}{c}{$E_{{\rm b}}$} & references for $E_{{\rm b}}$\\
 & & \multicolumn{1}{c}{$[m_{{\rm u}}]$} & & \multicolumn{1}{c}{$[\mbox{eV}]$} \\[1.0ex]\hline\\[-1.8ex]
1   & C          & 12.011 & 0.37 & 4.0  & priv\@. comm\@. $\;\dots$\\
2   & {\Ct}      & 24.022 & 0.34 & 5.0  & $\dots\;$ K\@. Larsson (2003)\\
2,1 & {\CtH}     & 25.030 & 0.34 & 6.5  & \citet{LaLuCa:93}\\
2,2 & {\CtHt}    & 26.038 & 0.34 & 0.27 & \citet{LaLuCa:93}\\\hline
\end{tabular}
%\\$^a$ priv\@. comm\@. K\@. Larsson (2003)
\end{table}