Lower panel: comparison of the [Mg/Fe] found from GIRAFFE spectra (green filled circles) with [Mg/Fe] found from UVES spectra for 44 bulge stars of the Lecureur et al. (2007) sample (open dotted circles). The thin (black filled squares) and thick (blue open triangles) discs abundances come from Bensby et al. (2004, 2005) and Reddy et al. (2006). Upper panel: difference in [Mg/Fe] found from GIRAFFE and UVES spectra for 44 stars (red clump open circle and RGB stars full circle) observed with both instruments. The black line shows the mean value of this difference ( − 0.06) and the two dotted lines show the ± 1σ around (σ = 0.16).
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