Fig. 5
[O iii] diagnostic diagram for candidate SySt among extragalactic PNe with He ii 4686/Hβ ratios >0.3 (blue points), <0.3 (green points), and He ii 4686 emission not detected (red points). The red line marks Kniazev et al. (2008) criterion for distinguishing between S- and D-type SySt. The gray lines indicate the regions of S- and D-type SySt proposed in this work.
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