\begin{table}%t1
\caption{Parameters used for different surfaces.}\label{para}
%\centering
\small
\begin{tabular}{lllll}
\hline \hline
 Parameter     & Flat olivine & Flat amorphous carbon & Rough olivine & Rough amorphous carbon \\ \hline
$E_{\rm b}$ (K) & 287          & 511                   & 287           & 511 \\
$E_{\rm D}$ (K) & 373          & 658                   & 373          & 658 \\
$E_{\rm L}$ (K) &              &                       & 112           & 197 \\
No. sites &   1      &  1                    & 5             & 5 \\
$F_0$ &   1          &  1                    & 0.6           & 0.6 \\
$F_1$ &              &                       & 0.1           & 0.1\\                 
$F_2$ &              &                       & 0.1           & 0.1\\
$F_3$ &              &                       & 0.1           & 0.1\\
$F_4$ &              &                       & 0.1           & 0.1\\ \hline
\end{tabular}
\end{table}