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Fig. 2.

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Comparison of incident radiation fields. The metagalactic background (KS19), at redshift 2.6, is represented by the black line. The dashed red (blue) line represents the unattenuated AGN field, with the typical luminosity of our sample, at a distance of 100 kpc (1 Mpc). The other lines depict the transmitted flux through a H I layer with logarithmic column density values of 18 (pink), 19 (yellow), 20.3 (orange), and 21 (brown). The vertical dashed lines correspond to the ionization energy of hydrogen and that required to ionize nitrogen to N4+.

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