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Fig. 4.


Core rotation rates as a function of surface gravity for models of the six subgiants computed for different values of the calibration parameter α. A model of the red giant KIC 4448777 is shown in orange with the corresponding value of the core rotation rate. Top: models computed with α = 0.5, which is the value needed to reproduce correctly the core rotation rates of 2 of the 6 subgiants. Bottom: models computed with α = 1.5, which is needed to reproduce correctly the core rotation rate of the red giant star KIC 4448777 (orange).

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