Maps of the H I column density (left panel) and metallicity (right panel) for the simulated galaxy Althæa at z ≃ 6, which lies at the center of each panel (Pallottini et al. 2017). The maps are 80 kpc on a side. Serenity-18 has characteristics very similar to Althæa, in this framework the DLA could trace the gas in the filament or in the periphery of one of the small clumps/satellites that are embedded in the same filament as the galaxy and that will eventually feed its growth.