Fig. 1.
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Observational constraints for the sample of SGB and RGB stars. Left panel: Kiel diagram. Individual squares represent the nine stars of Table 1 (colour-coded). Right panel: core rotation rates (filled squared) and surface rotation rates (open diamonds) of the sample of evolved stars Table 1. Parameters for the eight subgiants come from Deheuvels et al. (2014, 2020). Parameters for KIC 4448777 come from Di Mauro et al. (2016).
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