Fig. 8.
Silicon and oxygen abundances as a function of Teff. Circles represent the stars of the outer disk sample, color-coded by distance; triangles represent the three nearby stars. The dashed lines in both panels represent the solar abundances A(O) = 8.69 and A(Si) = 7.51 (Asplund et al. 2009). A slight, apparent correlation between abundances and Teff is likely connected to the radial gradient.
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