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Fig. B.1.

Fig. B.1. Refer to the following caption and surrounding text.

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Emergent Lyα line profiles from a grid of idealized radiative-transfer models (see text). Left: high-velocity shell (Vmax = 750 km s−1); varying NHI shows that log(NHI) ≲ 20 reproduces the observed profile but requires an extreme outflow. Right: low-velocity case (Vmax = 100 km s−1); matching the data demands very low columns, log(NHI) ≲ 14. Both panels assume the systemic redshift z = 5.7253.

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