\begin{table}%t5
\caption{Characteristic quantities and numerical coefficients used for 
calculating grain destruction and grain growth (SiC does not form in the ISM).}\label{TabDustPar}
%\centering
\small
\begin{tabular}{lcccc}
\hline\hline
 & Silicates & Carbon & Iron & SiC \\
\hline
$\tau_{j,\rm SNR}$ (Gyr) & 0.4 & 0.6 & 0.6 & 0.6 \\
$\eta_{\rm SN~II}$ & 0.00035 & 0.15 & 0.001 & 0.0003 \\
$\eta_{\rm SN~Ia}$ & 0.0  & 0.0  & 0.005  & 0.0 \\
key element & Si or Mg & C & Fe & Si \\
Atomic weight $A$ & 121.41 & 12.01 & 55.85  &  \\
bulk density $\rho_{\rm c}$ (g~cm$^{-3}$) & 3.13  & 2.25 & 7.86 & \\
\hline
\end{tabular}
\end{table}