Relationship between the age and the HB morphology parameter, HBR, in GCs. The solid circles are the selected GCs in our Galaxy, which are in the metallicity range of −1.6 < [Fe/H] < −1.1. The open circles denote our model calculations in Fig. 2, which from left to right correspond to cluster ages of 7, 10, 12, 13, and 14 Gyr, respectively.
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