Fig. 9

Top panel: distribution of the level of chromospheric activity, measured as the
, for the stars in our sample. The grey area shows the full sample, while the red highlights the fraction of new measurements. Bottom panel: level of chromospheric activity, measured as the
, against the color B–V of the stars. Early M stars refer to M0 to M3 stars, mid M stars are M3.5 to M6 stars.
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