Visualisation of the change of O abundance with respect to the assumption of LTE. Top panel: [O/Fe] assuming LTE, while middle and bottom panels: difference with respect to non-LTE abundances as a function of metallicity (middle) and effective temperature (bottom). Stars are shown as blue dots or in bins (containing a minimum of 5 stars). The plots indicate that the O abundance of hot stars need to be significantly corrected downwards by up to 0.7 dex, when estimated under the LTE assumption with [O/Fe] up to 1.0.
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