Fig. B.1
Dependence of the inferred oxygen abundance in two strong-line diagnostic ratios (upper panel: O3N2 from Pettini & Pagel 2004, lower panel: D16) on the ionization parameter U (from [S iii]/[S ii]) for the WR region. Each data point corresponds to a single spaxel and the grey region indicates the constraints from the temperature-sensitive [O iii](λ4363) emission line.
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