Fig. 4
a): log Teff vs. log g grid in the Besançon model. Black triangles indicate the coverage of the Besançon model (Robin et al. 2003) while red stars show the new extended grid. b): J–Ks vs. Teff relation. Black triangles show the old relation and red crosses the new one. The blue symbols is the relation for M giants from Houdashelt et al. (2000). c): Similar as b) but for K–[4.5] vs. Teff.
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