Fig. 2.
BPT (Baldwin et al. 1981) diagram used to classify our spectra of DustPedia galaxies based on classification curves (Kewley et al. 2001; Kauffmann et al. 2003). Star-forming HII regions are shown in blue, composite regions in red, and HIIregions containing an AGN in green. In this study, we computed metallicities only for the regions which are classified as star forming from this diagram, and discard AGN or composite regions.
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