\begin{table}%t9
%%\centering

\par
\caption{\label{t:7}Total mass of planetesimals for the planet migration up to its current position  in the  stellar system.}
\begin{tabular}{l c c c}      
\hline\hline
 Disk mass ($M_D$)    &   Corot-2b &   Corot-3b  & Corot-4b      \\
\hline
 $a_{P_{\rm i}}$ (AU)  & 2--5 & 2--5  & 2--5 \\
$M_{\rm Disk}$ ($M_{\odot}$) &  0.013--0.016  &   0.075--0.093   & 0.002--0.003   \\
\hline
\end{tabular}
\end{table}