2D map of the galaxies at z = 3 centered in the region of the most massive cluster of TNG300 (selected at z = 0). Blue circles indicate the galaxies belonging to the protocluster (C-Gal). The cluster LAEs (C-LAE) are shown as orange triangles and the field LAEs (F-LAE) are shown as green stars. The outermost black short-dashed circle indicates the distance of the farthest selected galaxy belonging to the protocluster region. The inner lines indicate the M₂₀₀ radius of the protocluster at z = 3, and z = 0 (long-dashed and solid-lined circles, respectively). The dark matter distribution projected across the thickness of 60 cMpc is shown in the background.