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Fig. 3.

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Flow chart summarising our selection criteria used to isolate candidates from the eFEDS AGN sample. Each box contains a selection method with the cuts applied and the number of sources obtained in the bottom right corner of each box. In brackets, we indicate the number of sources for z less than one (0.5 < z < 1) which we apply later on for SDSS spectra analysis. By reliable spectroscopic or photometric redshift, we only consider redshift grade 4 or 5 – see Salvato et al. (2022). Fopt refers to flux in the optical r-band. The box highlighted in red is sample A obtained after applying the colour selections in the top right of Fig. 1. The box highlighted in blue is the NH > 1021.5 cm−2 and selection or sample B in Fig. 2.

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