Top panel: the luminosity of the TRGB in the F814W-band as a function of the metallicity for different ages (12 Gyr: solid line; 9 Gyr: dotted line; 6 Gyr: dashed line). Bottom panel: the luminosity of the TRGB as function of the colour on the TRGB for different ages (12 Gyr: solid line; 9 Gyr: dotted line; 6 Gyr: dashed line). Different metallicities are indicated by the small dots.
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