Fig. 4
Sulphur abundances of our PNe alongside samples of H II regions from Fernández-Martín et al. (2017) (FM+’17) and Martín-Hernández et al. (2002) (MH+’02), and solar neighbourhood PNe from Pottasch & Bernard-Salas (2006). The solid line is the line of best fit for PN abundances. The dashed line represents that for the H II regions of the FM+’17 sample.
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