Fig. B.2
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Color-magnitude diagrams of TOI-521 and TOI-912. The location of main-sequence M-type stars is indicated by the black line, while the grey area accounts for the observed dispersion (Cifuentes et al. 2020). Young stars of the stellar moving Group 29 (Luhman 2018) and old low-metallicity stars of similar colors (Leggett et al. 2000) are also shown for comparison purposes. TOI-521 and TOI-912 appear to be normal main-sequence stars.
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