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Fig. 5.
Extensions of the Na–O anti-correlation IQR1 (left panel) and IQR2 (right panel) from the calibrations Eqs. (1) and (2), respectively. Symbols are as in Fig. 2. Black points indicate the calibrating GCs from our FLAMES survey, and their shape indicate the Galactic sub-population. Symbols and label are as in Fig. 4.
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