Fig. 3
Iron abundances from neutral and singly ionized lines (upper and middle panels, respectively) and their differences (lower panel) as a function of the effective temperatures. Filled symbols are stars with UVES spectra (blue circles: this work, red triangles: Carretta et al. 2007a), whereas open circles are stars with GIRAFFE spectra (Carretta et al. 2009b). Star-to-star error bars for GIRAFFE and UVES are indicated on the left and right side, respectively.
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