Fig. 1
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Color-magnitude diagram of NGC 1851 (black dots). The surveyed BSSs, RGB, and HB stars are plotted as blue, red, and green circles. A set of BASTI evolutionary tracks (Pietrinferni et al. 2021) with masses ranging from 0.9 to 1.5 M⊙ is overplotted as cyan lines. A BASTI isochrone of 11 Gyr is overplotted as an orange line, and a BASTI HB model is overplotted as a green line.
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