Boxplot showing the median (solid horizontal lines) and interquartile (25–75%) ranges of the chemical abundance ratios in NGC 5897 with the full abundance coverage depicted by the dashed error bars. Plus symbols designate 1σ outliers. All values are shown relative to the respective ionization stage, except for Fe i (relative to the cluster mean), Fe ii (relative to Fe i), and O i (relative to Fe ii.)
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