Fig. 1
[O iii] diagnostic diagram of Gutierrez-Moreno et al. (1995) for SySt (blue symbols) and PNe (gray symbols) in the MW. The S-type SySt are marked with open circles, the D′-type SySt with full circles, and D-type SySt with triangles. 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. Left and right panel: same diagram, but with different zoom.
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