Fig. 1.
Colour de-reddened (V − K)0 vs. observed I mag (bullets) for the sample observed by Tokovinin & Briceño (2018). Blue asterisks represent the model I magnitudes corrected for the distance modulus 5.8 mag (Wilkinson et al. 2018), and the model colours from Bressan et al. (2012). Solid lines are linear fits. We note that the model values are displaced on average by 0.75 mag from the magnitude of observed binary systems.
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