Successive zooms on one of the most massive galaxies in the high-resolution region at z ∼ 7. From the top left clockwise, the first three panels show the hydrogen column density in a region of dimension 1.5 Mpc, 150 kpc and 15 kpc on a side, respectively. Bottom left panel: stellar density distribution in the same region as the bottom right panel. The numbered crosses mark the position of the corresponding BHs.