Fig. 10
vs. [O ii]/[O iii] for the models. The colors code the softness of the radiation emitted by the stellar population. Left panel: thin shell models (fr = 3.0), right panels: filled sphere models (fr = 0.03). The dashed red line is the fit by Díaz et al. (2000). The blue lines correspond to our fit (taking only star forming regions into account, i.e., Q0 / 1 > 0.55).
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