Fig. 4
Abundance ratios vs. oxygen abundance. The emission-line galaxies from this paper are shown by large circles, the filled circles representing galaxies with element abundances derived by the direct method, and the open ones galaxies with element abundances derived by the semi-empirical method; small filled circles are XMD emission-line galaxies from Izotov & Thuan (2004a), and dots are SDSS galaxies from Izotov et al. (2006a).
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