Table 1
Analytic fits to our reference calibrations of the RGB-tip magnitude-colour relations.
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| F110WTRGB |
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| F160WTRGB |
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Notes. Calibrations are based on MARCS colours and BCs and are valid for 10-4 ≤ Z ≤ 0.04 except for the vs. (V − I)TRGB relation, valid up to Z ≈ 0.02. Physical inputs in the models, including initial composition, are described in Sect. 3.2. Models do not include α-enhancement (see text for discussion).
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