The distribution of stars on the main sequence turn-off for different elliptical radii. Two isochrones representative of a metal-rich ([Fe/H] ≈ −1.10, [α/Fe] ≈ −0.10, age = 7 Gyr, red) and a metal-poor ([Fe/H] ≈ −2.45, [α/Fe] ≈ 0.40, age = 14 Gyr, blue) population are overlaid in each panel.
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