Table 2: Median ages and spreads for the sub-samples. The first column gives the central metallicity, and the second column the $\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 ${\it TD}/D>10$.
[Fe/H] [$\alpha $/Fe] N Age (Gyr) N Age (Gyr)
      ${\it TD}/D>2$   ${\it TD}/D>10$
      1/4 1/2 3/4   1/4 1/2 3/4
-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


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