Fig. 4
Comparison between iron abundances from spectroscopy [Fe/H] and metal abundances derived from colours along the RGB ([m/H]). Different colours are for stars of the different groups (see Fig. 1). Results for all stars are plotted in panel a); panel b) is is only for metal-poor stars; panel c) is only for metal-intermediate stars; and panel d) is only for metal-rich stars.
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