Fig. 7.
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Theoretical TRGB absolute magnitudes in the I (Cousins) and JHK (Bessel & Brett system) filters as a function of [Fe/H], for the four choices of conductive opacities discussed in this section (see labels and text for details). We also show (circles with error bars) the measured TRGB absolute magnitude in the Galactic globular clusters 47 Tuc and ω Centauri.
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