Slice gas density maps in the x-y plane in the four models presented in Table 1 at different redshifts. The maps describe the density distribution in the central region of the simulations in the FC22 (first column from left), ‘Winds, SFE=0.1’ (second), ‘Winds, SFE=1.0’ (third) and ‘Winds, THIMF’ models. The maps are at z = 15.5 (upper row), z = 13 (middle row) and z = 10.5 (bottom row). The horizontal white solid lines shown in the left-hand column-panels indicate the physical scale.