Fig. 4.
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N/O, Ne/O, Ar/O, and S/O ratios with respect to oxygen abundance. Blue circles are our sample of extremely metal-poor galaxies. Gray points and black triangles represent a reference sample of H II regions and BCD/BCG galaxies, respectively, with measured oxygen auroral line collected from the literature. Red dashed lines are medians of N/O, Ne/O, Ar/O, and S/O for the reference H II regions with O/H in the range 7.0−8.0 dex.
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