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Fig. 4.
Ionising (λ ≤ 912 Å) photon rate vs. redshift for the sources with spectroscopic redshifts. The filled symbols and histogram represent the FIR detections, unfilled for the non-detections. As in Fig. 3, the shapes represent the NED classification: stars for QSOs, circles for galaxies, and squares for unclassified.
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