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 modeling and fromnew literature values of the effective temperature, the surface gravity, and the metallicity by Petigura et al. (2017). The gyrochronological age is indicated by the green solid line and its 1-σ range with the green dashed lines.
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