Fig. A.3.
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BPT diagram of HERG objects (blue crosses) and of UNCs selected as SF (UNC-sf, yellow). Circles coloured by O[III] SNR correspond to the subsample of UNC-sf that lie above the D4000 divide line in Figure A.1. For reference, we show the Kewley et al. (2001) maximum starburst line (dotted) and the Kauffmann et al. (2003) classification line (dashed).
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