Top: distribution of stars in the [Fe/H]-[α/Fe] plane. The color and size of the symbols indicate the age of the stars, as shown by the vertical colorbar on the right of the panel. The orange curve is our model for the inner disk (Haywood et al. 2018; Snaith et al. 2015). Colored points are selected to be above the model curve shifted vertically by −0.05 dex. The ticks and numbers on the right side of the plot indicate the age of the model at different alpha-abundances. Bottom: distribution of stars in the age-[α/Fe] plane, with stars selected as in the plot above. The color of the points now indicate the metallicity of the stars (right vertical colorbar).
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