Fig. 1.
ACS/HRC colour-magnitude diagram for G280. The blue lines are Dartmouth isochrones with ages of 11 Gyr and [Fe/H] = −1.4, −1.0, −0.7, and −0.4 (Dotter et al. 2007), while the green line is a 10 Gyr MIST isochrone with [Fe/H] = −0.5 (Choi et al. 2016; Dotter 2016). Red dots are ACSGCS data for 47 Tuc (Sarajedini et al. 2007).
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