Fig. 5.

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Relation between the LyC escape fraction and the spatial extent of the neutral and/or low-ionization (left panel) and ionized gas (right panel) as traced by the Mg II and [O II] scale lengths, respectively. The points are color-coded by the O32 values measured in Flury et al. (2022a). Objects with undetected Mg II are shown with higher transparency at x = 0. The red squares indicate the fraction of strong LyC leakers (5σ detection and following Flury et al. 2022a) detected in the bin delimited by the horizontal error bars. The errors on the fractions correspond to a 1σ confidence interval (see Sect. 5.1). While weak and non LyC emitters show a wide diversity of Mg II and [O II] spatial extents, the neutral and/or low-ionization and ionized gas of strong leakers is compact (see Sects. 4.1 and 5.3).
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