\begin{table}%t2
%\centering
\par
\caption{\label{tab:dust}Dust species used in this study with their commonly-used name, their size, shape and the source of the optical constants. The  size distribution is that derived by \cite{Mathis1977} and the cross  section are computed in the CDE~(Continuous Distribution of  Ellipsoids) approximation.}
\small  \begin{tabular}{lccccc}
\hline\hline\noalign{\smallskip}
Name & Composition & Lattice structure& Size ($N(\alpha)\sim\alpha^{-3.5}$) & Shape&Reference \\
\hline
Alumina &  Al$_2$O$_3$  & amorphous  & 0.01--1~$\mu$m & CDE &  \cite{Begemann1997,Koike1995} \\
Melilite  &  Ca$_2$Al$_2$SiO$_7$ & amorphous & 0.01--1~$\mu$m & CDE &
\cite{Mutschke1998,Jaeger1994} \\
Olivine &  Mg$_{0.8}$Fe$_{1.2}$SiO$_4$ & amorphous & 0.01--1~$\mu$m & CDE & \cite{Dorschner1995} \\
MgFeO &  Mg$_{0.1}$Fe$_{0.9}$O & amorphous & 0.01--1~$\mu$m & CDE & \cite{Henning1995} \\
Metallic iron  &  Fe  & crystalline  & 0.01--1~$\mu$m & CDE & \cite{Henning1996} \\
Carbon & C  & amorphous & 0.01--1~$\mu$m & CDE & \cite{Preibisch1993} \\
\hline
\end{tabular}
\end{table}