Color − magnitude diagram using Yonsei-Yale isochrones for 1 Gyr (dashed lines), 5 Gyr (dotted lines), and 12 Gyr (full lines), and metallicities [Fe/H] = −3.6 (lowest value possible within the Yonsei-Yale set in black), [Fe/H] = −3.0 (gray), [Fe/H] = −2.0 (red), [Fe/H] = −1.0 (blue), [Fe/H] = 0.0 (green). [α/Fe] is set to +0.4 for all isochrones except for [Fe/H] = 0.0, which have [α/Fe] = 0.0 and an extra set of isochrones plotted for [Fe/H] = −1 and [α/Fe] = 0.0 (cyan). The vertical line roughly indicates the onset of the RGB.
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