Fig. A.4.
Ratio of the luminosity of the HRD in Fig. 10 and the luminosity of a 13 Gyr isochrone from BHAC15 for the measured effective temperatures as a function of [Fe/H] using the pseudo equivalent width 
of Schöfer et al. (2019) for the color coding. Negative values of 
denote Hα emission. Error bars are omitted for clarity. See Fig. 10 for the identification of the encircled stars.
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