Radius-age diagram of Kepler-9 from MESA stellar evolution models (MIST). The black star and the red, orange, and grey dots correspond to the best matching value and the 1, 2, and 3σ areas, respectively, derived from results on the density of the data set III photodynamical modelling and from literature values of the effective temperature, the surface gravity, and the metallicity by Holman et al. (2010). The gyrochronological age is indicated by the green solid line and its 1-σ range with the green dashed lines.
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