Fig. A.1
X-Shooter spectrum: Lyα lines at z = 6.327 are indicated in red, while the lines of the intervening system at z = 4.804 are marked in green. Black lines at the top of the panel mark telluric absorptions, with the thickness of the line indicating the absorption strength. At the bottom the error spectrum is shown (blue). The spectrum has been smoothed with a Gaussian filter.
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