Top:σ(S​_ph) as a function of ⟨S​_ph⟩ for the NGC 6811 members. The F-type stars are not included in this representation as there is no evidence for P_rot bimodality in this regime. The reference Kepler sample is shown in gray, where the σ(S​_ph) values were taken from Santos et al. (2023). Bottom:σ(S​_ph) as a function of the distance to the intermediate-P_rot gap, where a few data points with large |δlog P_rot| were omitted for illustration purposes. The symbol size indicates the average magnetic activity level. The color code in both panels corresponds to the distance to the intermediate-P_rot gap.