Fig. 9.
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Gaia EDR3 optical CMDs for the clusters: Kronberger 99 (left panel), Kronberger 143 (middle panel), and ESO 92-18 (right panel). The green, yellow, and pink lines are the Dartmouth isochrones with [α/Fe]= + 0.4, +0.2, 0, respectively. The dotted red lines are the PARSEC isochrones. We keep the age and metallicity fixed as listed in Table 2.
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