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Fig. 4.

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Activity-rotation diagram for the NGC 6811 members (circles) in four Teff ranges around the transition associated with the intermediate-Prot gap. To better identify the gradual Sph shift, the crosses represent NGC 6811 members, but of any Teff. The reference Kepler single MS sample is shown by the dots and density contours in gray. The color-code for the circles and dots is related to the distance to the intermediate-Prot gap, which corresponds to the difference between the logarithm of a given star’s Prot minus the logarithm of the gap location (truncated at δlog ± 0.4 for illustration purposes). The lightest colors correspond to the stars closest to the gap.

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