Fig. A.1.
Public SDSS and 6dF spectra of sources whose redshift values in our sample are different to those in the 3FHL catalogue. When needed, the lines used to measure the redshift are marked in the plots. First row, left: 1RXS J0022+0006, z = 0.3057; right: PMN J0622−2605, redshift unknown. Second row, left: NVSS J110735+022225, z ≥ 1.0743; right: S4 1250+53, z ≥ 0.664. Third row, left: NVSS J141028+143841, z = 0.144; right: SUMSS J144236−462302, z = 0.1026. Fourth row, left: RBS 1432, z ≥ 0.739; right: 1RXS J195815.6−301119, redshift unknown (but z = 0.119 confirmed here; see Sect. 6.15). Fifth row, left: MITG J225717+2409, z ≥ 0.864; right: 1ES 2322−409, redshift unknown (but z = 0.1738 measured here; see Sect. 6.19).
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