Fig. 7

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Relation between stellar radius and effective temperature for the 16 000 most active main-sequence stars from Pietras et al. (2022) (blue dots). The red line presents the fit described by Eqs. (10)–(13), the red interval represents the fit error and the orange star corresponds to the parameters of the Sun. The gray points represent possible falsely detected main-sequence stars in the MAST catalog (2000 stars).
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