Fig. 4
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Bar plot illustrating the performance of the colour criteria in selecting AGN for the QSO2 candidates, as described in the studies by Stern et al. (2012); Mateos et al. (2012); Mingo et al. (2016); Blecha et al. (2018); Carvajal et al. (2023). Each bar represents a specific subset: (a) [NeV] emitters (30 sources), (b) sources with clean spectra (138 sources), and (c) all candidate sources (365 sources).
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