Left panel: distribution of calibrated (Teff, log(g)) colour coded by [Fe/H] for the entire sample. We also show the cuts used to define the sample of RCGs as dashed lines (see Eq. (1)); the diagonal cuts correspond from left to right to metallicities of [Fe/H]= − 0.5, 0.0, 0.5. Right panel: histogram of the surface gravity, log(g). The peak at log(g)≈2.3 is due to RCGs and is clear and distinct.
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