Fig. 2
Intensity ratio of the [O iii] λ5007 to λ4959 lines as a function of the flux of [O iii] λ5007 (in units of Hβ). The dashed line represents the mean value for the present TNG observations of PNe, and the dotted lines are 5% deviations from it. The observed PNe are marked by triangles, and the star symbols mark values for the suspected symbiotic stars observed.
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