Rotation periods of the Praesepe (blue) and the Hyades (orange) star clusters derived by Douglas et al. (2019) vs. effective temperature Teff. Gyrochronology isochrones of 750 Myr and 428 Myr are shown in black and red, respectively. The solid lines down to 4000 K indicate the temperature range used in the fit, and the dashed lines show the extrapolation of the fit down to 3500 K.
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