Fig. 1
12 + log (O / H) vs. 12 + log (Ne / H) in PNe in M33 (black triangles), M81 (red squares), and NGC 300 (blue filled circles). PNe in Local Group dwarf galaxies are shown as empty circles. The continuous line is the linear fit of the abundances of PNe in the whole sample of galaxies, while the dotted line is Izotov et al. (2006) fit of star-forming galaxies.
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