Fig. 7
Classical BPT emission-line diagnostic diagrams (Baldwin et al. 1981; Veilleux & Osterbrock 1987) with the demarcation curves of Kewley et al. (2001) (upper curve, red) and Kauffmann et al. (2003) (lower curve, green) for each galaxy. Empty circles correspond to Z0, blue circles to Z1, and orange squares to Z2. Symbol sizes are proportional to galactocentric distance, i.e. the larger symbols are, the farther from the centre.
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