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Fig. 6.

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Presence of the Fe II line groups in different subsets. The sample is divided into several subsets with n spectra following different ranges of line widths (FWHM Fe II or FWHM Hβ). The histograms show the percentage of spectra with present Fe II lines from different Fe II groups (H, OL, G+, P+, F, S, G) in each subset.

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