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Fig. 7


Same as Fig. 6 for [α/Fe] of the AMBRE spectra differing by  ± 0.4 dex between the model atmosphere and the spectral synthesis. Left panel: typical metal-poor stars with low α-enrichment. The [α/Fe] ratio of the adopted model atmosphere for the AMBRE spectra is always +0.4 dex, while the spectral synthesis was performed assuming [α/Fe] = +0.0. Right panel: very metal-rich stars with extremely low α-enrichment. The adopted model atmosphere for the AMBRE spectra correspond to [α/Fe] = +0.0, while we assumed [α/Fe]  =  −0.4 for the spectral synthesis presented here.

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