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Fig. 4


Abundance ratios [Fe/H] i (upper panel) and [Fe/H] ii (lower panel) as a function of Teff for all analysed stars. Blue squares are stars with UVES spectra, filled circles are those with GIRAFFE spectra observed with both the HR11 and HR13 setups, and crosses indicate stars observed with only the HR11 (black) or the HR13 (green) setup. Error bars on the right and on the left are star-to-star errors for targets observed with UVES and GIRAFFE, respectively.

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