Fig. 6
Several calibrations of the TRGB magnitude in the I-Cousins band, as a function of the metallicity. We display results based on the LUNA and NACRE 14N(p,γ)15O reaction rate, and the semi-empirical calibration by Ferraro et al. (2000). The two filled circles with error bars correspond to the empirical estimates for ω Cen and 47 Tuc, obtained by Bellazzini et al. (2004).
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