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Fig. 5.
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Theoretical 12 Gyr isochrone red line superimposed to M4 data from Stetson et al. (2019). The isochrone was computed for [Fe/H] = −1.17 and Y = 0.252. The value of the mixing-length parameter αml = 1.90 was chosen to best represent the RGB region. The adopted distance modulus and reddening are from Hendricks et al. (2012).
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