\begin{table}%t5
\par
\caption{\label{tab5}Initial value of the parameters defining the two cases.} 
%\centering
\par
\begin{tabular}{l c c}
\hline \hline
   & Case 1 & Case 2\\
\hline
   Dust/ice & 1  & 1 \\
   Initial temperature (K) & 25 & 25 \\
   Surface albedo & 0.04 & 0.04   \\
   Surface emissivity & 0.96 & 0.96   \\
   Spin period (h) & 10 & 10   \\
   Initial pore radius (m) & 10$^{-4}$ & 10$^{-4}$   \\
   Initial porosity & 0.7 & 0.7   \\
   Initial radius (km) & 10 & 10   \\
   CO$_2$/H$_2$O & 0.03 & 0.1   \\
   CO/H$_2$O & 0.2 & 0   \\
   Trapped CO & 0.1 & 0   \\
   Dust size classes & 6 & 6   \\
   Dust size ranges (m) & 10$^{-6}$--10$^{-1}$ & 10$^{-6}$--10$^{-1}$   \\
   Dust density (kg $\;$ m $^{-3}$) & $2.5 \times 10^{3}$ & $2.5 \times 10^{3}$   \\
   Dust conductivity (K $\;$ kg$^{-1} \;$ m$^{-3}$) & 2 & 2   \\
\hline
\end{tabular}
\end{table}