Fig. 6.
Averaged spectra. We display two stack spectra. In blue we show the average of all the spectra (79) with IGM transmission lower than the mean. The mean redshift in these spectrum is ∼4.36. In red we show the average of all the spectra (101) with IGM transmission higher than the mean, with a mean redshift of ∼4.60. The stack spectra have been made with the specstack program (Thomas 2019a).
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