\begin{table}%t4
\caption{Dust species considered in the model calculation.}\label{TabDuSp}
%\centering
\small
\begin{tabular}{lcccc}
\hline \hline
          & Silicates & Carbon & SiC  & Iron \\
\hline\\[-3mm]
AGB stars & $\surd$ & $\surd$ & $\surd$ & $\surd$ \\
SN II     &  $\surd$ & $\surd$ & $\surd$ & $\surd$ \\
SN Ia     & --- & --- & --- & $\surd$ \\
ISM       &  $\surd$ &  $\surd$ & --- & $\surd$  \\
\hline
\end{tabular}
\end{table}