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Table 2.
Chemical gradients.
| Combined sample | Present sample | ||
|---|---|---|---|
| Species | d[X/Fe]/d(Age) | n | d[X/Fe]/d(Age) |
| (dex/Gyr) | (dex/Gyr) | ||
| O | 0.018 ± 0.004 | 114 | 0.008 ± 0.011 |
| Na | 0.013 ± 0.013 | 120 | −0.031 ± 0.040 |
| Mg | 0.029 ± 0.004 | 147 | 0.036 ± 0.007 |
| Al | 0.027 ± 0.005 | 130 | 0.009 ± 0.008 |
| Si | 0.007 ± 0.002 | 135 | −0.014 ± 0.006 |
| Ca | 0.013 ± 0.003 | 135 | 0.082 ± 0.028 |
| Ti | 0.000 ± 0.004 | 140 | 0.002 ± 0.010 |
Notes. The chemical gradient for the combined sample (second column) along with the number of clusters it is calculated on. The gradient for the 18 SPA OCs in the present paper is given in the last column.
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