Fig. 13.
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Difference Δ[α/Fe] between estimated average [α/Fe] for the α-rich and α-poor stars in the synthetic sample, after training on the GALAH sample. For each Teff–log g node, the average is taken over [Fe/H] and A0. Convex hull of training sample shown as dashed line. We note that if this plot had used the same colour scale as in Fig. 9, it would seem almost uniform to the eye.
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