Comparison between oxygen abundances (O/H)PLR given by the purely linear relation (O/H) – Rg and abundances (O/H)BLR given by the broken linear relation at the galaxy centres (circles), at the break radii (plus signs), and at the optical radii R25 (triangles) of the galaxies. The solid line indicates equal values. The two dashed lines show the ± 0.05 dex deviations from unity.
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