\begin{table}%t2
\caption{\label{tab:agemet}Median ages and spreads for the sub-samples.
        The first column gives the central
        metallicity, and the second column the \mbox{$\alpha$-enhancement}.
	Columns~3$-$6 give the following for the samples
	selected with ${\it TD}/D>2$: the number of stars in the sub-sample,
        the lower quartile for the age distribution, the median age,
        and the upper quartile for the age distribution.
	Columns~7--10 give the same information but for the samples
	selected with ${\it TD}/D>10$.
        }
%\centering
\par
\begin{tabular}{rrrrrr|rrrr}
\hline\hline
[Fe/H]  & [$\alpha$/Fe] & $N$ &  \multicolumn{3}{c|}{Age (Gyr)} & $N$ & \multicolumn{3}{c}{Age (Gyr)} \\
        &               &     &  \multicolumn{3}{c|}{${\it TD}/D>2$}  &     & \multicolumn{3}{c}{${\it TD}/D>10$} \\
        &               &     & 1/4 &   1/2   & 3/4             &     & 1/4 &   1/2   & 3/4           \\
\hline
 $-$0.90 & +0.35 &   25  &     8.7  &   13.6  &  15.9           & 19  & 11.5  & 14.0  &  16.6         \\
 $-$0.80 & +0.35 &   39  &    11.5  &   13.5  &  16.2           & 31  & 12.5  & 13.5  &  16.0         \\
 $-$0.70 & +0.35 &   61  &    11.5  &   13.2  &  16.2           & 47  & 11.8  & 13.6  &  16.5         \\
 $-$0.60 & +0.35 &   65  &    11.1  &   13.0  &  15.0           & 44  & 11.2  & 13.0  &  14.9         \\
 $-$0.50 & +0.35 &   71  &     9.3  &   12.1  &  14.0           & 46  &  9.5  & 11.5  &  14.0         \\
 $-$0.40 & +0.30 &   58  &     8.7  &   11.7  &  13.5           & 39  &  8.5  & 11.2  &  13.8         \\
 $-$0.30 & +0.20 &   62  &     8.0  &   10.8  &  12.8           & 32  &  8.1  & 10.7  &  12.6         \\
 $-$0.20 & +0.15 &   60  &     7.4  &    9.5  &  10.5           & 26  &  7.8  &  9.6  &  10.6         \\
 $-$0.10 & +0.10 &   56  &     5.5  &    7.7  &   9.8           & 22  &  7.0  &  8.8  &  10.5         \\
    0.00 & +0.03 &   35  &     4.5  &    8.1  &  10.1           & 14  &  6.5  &  9.7  &  10.5         \\
\hline
\end{tabular}
\end{table}