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Fig. 6

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Oxygen abundance vs. absolute blue magnitude for Compact Narrow Emission-Line Galaxies (CNELGs, yellow filled circles), star-forming Emission Line Galaxies (ELGs, cyan open circles), four field galaxies with emission lines (filled black circles), nearby dwarf irregulars (open triangles), local spiral galaxies (open circles), local HII galaxies (open squares), NGC 4650A (red star) (Spavone et al. 2010), the polar disk galaxy IIZw71 (Perez-Montero et al. 2009), UGC 7576 (black star), and UGC 9796 (blue star) (this work). The dashed line indicates the solar oxygen abundance.

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