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Fig. 10

image

Panel a: N2 abundance index as a function of the O3N2 abundance index for objects with Te-based abundances (compilation from Pilyugin & Grebel 2016). Panelb: (O/H)Te abundances (grey points) and the (O/H)M13,O3N2 abundances (red points) for individual objects, and the mean (O/H)Te abundances (plus signs) in bins with a width of 0.3 in O3N2 as a function of O3N2. Panelc: (O/H)Te abundances (grey points) and the (O/H)M13,N2 abundances (red points) for individual objects, and the mean (O/H)Te abundances (plus signs) in bins with a width of 0.2 in N2 as a function of N2. Paneld: (O/H)Te abundances (grey points) and the (O/H)PG16 abundances (red points) for individual objects, the mean (O/H)Te abundances (plus signs) and (O/H)PG16 abundances (crosses) with a bin width of 0.3 in O3N2 as a function of O3N2.

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