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Fig. 3.

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Similar to Fig. 2, but for the average photometric magnetic activity. NGC 6811 members are highlighted by the blue circles, whose size indicates the rotation rate: the larger the symbol, the faster the stellar rotation. The gray line corresponds to the smoothed ⟨Sph⟩ for the cluster. The semitransparent shaded region marks the Teff range highlighted in the inset of Fig. 2. The density map represents the reference Kepler sample of field stars.

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