Synthetic spectrum fit to the forbidden [O i] line at 6300.3 Å in the observed spectrum of HD 157214 (left panel) and to the barium line at 5853 Å in the observed spectrum of HD 52711. The observed spectra are shown by solid lines with dots. The dark grey solid lines are synthetic spectra with [O/Fe] = 0.42 ± 0.1 and with [Ba/Fe] = − 0.08 ± 0.1, respectively.
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