Fig. 6.
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Nitrogen vs. oxygen abundance, with symbols representing the same objects as in Fig. 2. The SDSS DR12 galaxies (black scatter diagram) are limited to SFGs with appropriate AoN in the line fluxes relevant for the determination of N/O and O/H with the direct method. The green dashed line is the generic scaling relation from Nicholls et al. (2017), i.e. log(N/O) = log(10−1.732+10logO/H + 2.19).
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