Fig. 3.
Newly developed surface brightness–colour relations after applying stellar characteristics, interferometric and photometric criteria. From top-left to bottom-right panel: SBCRs for F5/K7 giants, F5/K7 sub-giants/dwarfs, M giants and M dwarfs. The shaded grey area corresponds to the 1-σ confidence interval computed according to Eq. (A.5). The uncertainty on the surface brightness of each measurement was divided by the rms.
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