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Fig. 1

image

Cartoons showing a fully covering ≲ 1017 cm-2 H i screen (left), the picket fence scenario of a clumpy medium with many ionized sight lines and weak radiative transfer effects in Lyα (center), and the scenario with a few ionized channels through a neutral medium that is optically thick in both LyC and Lyα (right). Blue arrows show Lyα, and red arrows LyC.

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