Age dependent activity indicators. Colour and line shapes distinguish different Teff bins. Detection thresholds are derived from synthetic flare injections and averaged in each bin. For M 67, available upper limits are given with arrows. The highest energy we detect is ∼6 × 1034 erg. Top panel: flare rate FR; centre: absolute flare luminosity in the Kepler band LKp, flare. Bottom panel: flaring activity FA (see definitions in Sect. 4.2). Grey dotted lines indicate the Skumanich age−1/2 law for comparison.
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