\begin{table}%t3 
\caption{Properties of the best-partition groups.} \label{partition}  
%\centering
\par
\begin{tabular}{lccccccccc} 
\hline  \hline \\[-3mm]
      Group & $\overline{\rm [Fe/H]}$ & $\overline{u}$ & $\overline{v}$  &  $\overline{w}$  & $\sigma_u$ &   
     $\sigma_v$  & $\sigma_w$ & $\overline{\rm Age}$& Number \\   
\hline 
    I  & --0.07 & 5 &  --9 & --3 & 38 & 20 & 16 & 3.5 & 359 \\ 
    II & --0.37 & 4 & --55 & --3 & 84 & 51 & 39 & 8.1 &  66 \\ 
\hline 
\end{tabular} 
\end{table}