Fig. 9
M81. Upper panel: individual and binned results for H ii regions (upper panel) and PNe (lower panel). The O abundances of PNe are taken from Stanghellini et al. (2010) and those of H ii regions from Stanghellini et al. (2010, 2014) and Patterson et al. (2012). The continuous black lines are the gradient of Stanghellini et al. (2014) for PNe and that of Stanghellini et al. (2014) for H ii regions. Lower panel: weighted linear fits of PN and H ii region binned metallicities. Symbols and curves as in Fig. 6.
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