Fig. 8
M31. Upper panel: individual and binned results for H ii regions (upper panel) and PNe (lower panel) in M31. The O abundances of PNe are from Sanders et al. (2012; blue stars) and those of H ii regions are from Zurita & Bresolin (2012; black empty stars) and from Sanders et al. (2012; red crosses). The black filled circles are the H ii regions binned metallicities of Zurita & Bresolin (2012). Lower panel: weighted linear fits of PN and H ii region binned metallicities. Symbols and curves as in Fig. 6.
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