Fig. 7
DARMOUTH isochrones for [Fe / H] = −3.5 and different ages from 16 to 10 Gyr (red dashed lines), and blue dashed lines are the HB and AGB theoretical tracks for [Fe / H] = −2.5 for two different relative masses (M = 0.6 and M = 1.0). The black diamonds represent the stars of this work and their internal uncertainties derived with the FERRE code.
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