Fig. 22
Chromospheric emission indices SHK collected from the literature vs. B−V color for 408 stars in our sample. The blue data points denote the stars reported as active. The solid line is the lower envelope for main-sequence dwarfs, defined by Isaacson & Fischer (2010) as a basal activity level SBL. Four data points with the largest values of SHK lie outside of the y-axis range.
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