Fig. 5.
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Relation between [OI]/[OIII] and HeII/Hβ for the DIS, BMC, and KAA models (shaded areas) along with the observational sample (dots). From top to bottom we show the increasing ionisation parameter (lines). In approximately two-thirds of the galaxies, HeII emission is not detected with relative intensities below I(4686)/I(Hβ) ∼ (2−3) × 10−3.
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