The I-band TRGB magnitude is nearly constant at -4.02 mag below [Fe/H] = -1.2, but appears to fade at higher metallicity, shifting the derived Hubble constant to about 71 km/s/Mpc.
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Dependence of Multi-band Absolute Magnitudes and Color Indexes of the Tip of Red Giant Branch Stars on Metallicity in the Galactic Globular Clusters
The I-band TRGB magnitude is nearly constant at -4.02 mag below [Fe/H] = -1.2, but appears to fade at higher metallicity, shifting the derived Hubble constant to about 71 km/s/Mpc.