Fig. A.2.
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Nitrogen abundances and oxygen to argon ratios for M31 disc PNe. Top: Nitrogen abundance measurements compared for seven M31 disc PNe between Kwitter & Henry (2022) and this work. Bottom: log(O/Ar) versus 12 + log(Ar/H) distribution of 91 M31 disc PNe coloured by their log(N/Ar) values. Measurement uncertainties are shown in grey. The PNe are binned as a function of their 12+log(Ar/H) values. For each bin the mean log(O/Ar) is plotted as black diamonds, and the error bar shows their standard deviation.
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