Fig. 4
Timescales of variability of 
and 
, averaged in temperature bins (a): log(τ1) and (b): log(τ2) indicated by X symbols with error bars for the stars with 16 < P < 30 days vs. effective temperature Teff. For comparison, the estimates of the τMLT
turnover time by Noyes et al. (1984), are depicted by a dashed line and Wright et al. (2011) as error bar crosses.
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