Properties of Hα-selected star-forming regions as a function of deprojected distance from the galaxy centre (Sect. 2.3): Hα flux, equivalent width, SFR from Hα flux, stellar mass density, specific SFR, extinction, and three metallicity measurements based on [SII], [NII], and Hα fluxes (Dopita et al. 2016), [OIII], [NII], Hα, and Hβ lines, and just [NII] and Hα lines (Pettini & Pagel 2004). The region in which SN 2009bb exploded is indicated by red circles. The linear fits to the data (Table 6) are shown as solid lines. The solar metallicity of 12+log(O/H) ~ 8.66 (Asplund et al. 2004) is marked as a dashed line.
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