Fig. 14.

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Relative transmission in the GP trough after normalising the spectra to a model of the quasar continuum in the Lyα forest. The individual absorber redshifts are marked where their expected Lyα wavelength falls. Red dashed lines are absorbers that are only low-ionisation systems, and blue dashed lines mark absorbers with high-ionisation lines from C IV. Two of the absorbers lie close to the quasar redshift, and their Lyα wavelengths fall in the proximity region of the quasar spectrum. A single low-ionisation absorber at z = 5.928 is associated with a transmission spike in the intervening IGM illustrated by the green triangles, while four of the high-ionisation absorbers lie within ±2000 km s−1 from the IGM transmission spikes at z ∼ 5.8.
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