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Relation between effective temperature Teff and intrinsic colour (GBP − GRP)0. The continuous black line denotes our best-fit model (Eq. (4)), while the dashed vertical lines denote the limits of validity of the relation. Coloured dots represent the samples of Casagrande et al. (2010), Mann et al. (2015), and Pecaut & Mamajek (2013) discussed in the text in Sect. 5.1.
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