Fig. 14.
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N/O vs. O/H diagram for the abundances at the centres (panel a) and at the optical radii (panel b). The circles designate galaxies with an L-type abundance distribution, the plus signs mark galaxies with an LS-type abundance distribution, and crosses are galaxies with an S-type abundance distribution. The yellow points denote H II regions in nearby galaxies (compilation in Pilyugin & Grebel 2016).
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