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Fig. 11

image

Upper panel: [O/H] vs. [Fe/H] for OI 6158 Å. Only stars with EW relative error below 25% are considered. Solid line represent the average oxygen abundance. The 1, 2 and 3 sigma levels of dispersion around the mean are presented as shaded areas. Dashed line shows the average uncertainties. For plotting purposes the average uncertainties are shown around the mean abundance. Lower panel: difference between the ± 1σ width of the scatter around the mean and the ± 1σ width of the uncertainties.

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