|a Metallicities and values inferred using the relation by Ledoux et al. (2006); b D-index calculated using Eq. 6, following the method recommended by Ellison et al. (2009); c D-index calculated without including the iron column density term (see Ellison et al. 2009); d iron lines are saturated. The D-index calculated without including the iron column density term would be ;|
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