Fig. A.1.
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Redshift-D4000 two-dimensional histogram of SDSS galaxies (viridis coloured). We highlight our HERG sources (blue crosses), the UNCs of AGN type (UNC-agn, pink), and the UNCs of SF type (UNC-sf, yellow). Grey circles above the divide line mark UNC objects lying within the region occupied by known high- excitation radio galaxies.
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