Three-dimensional spatial density ρ(x) in typical configurations of protohalos studied in this work for the final snapshots of our highest force resolution Vlasov runs. Left panels: initial conditions given by three crossed sine waves (from top to bottom): VLA-SYM-HRS with ϵ = (1, 1), VLA-ANI2-HRS with ϵ = (3/4, 1/2), and VLA-Q1D-HR with ϵ = (1/6, 1/8). Right panels: protohalos extracted from our ‘CDM’ runs. Top two panels: halo 1 and halo 2, extracted from VLA-CDM12.5-HR, respectively and bottom panel: halo 3, extracted from VLA-CDM25-HR. The size of the subvolume on display as well as the expansion factor value are indicated in each panel. The spatial resolution scale in the left panels is ε_r = L/512 ≃ 0.002L, which represents about 1/51 of the subcube size; in the two upper right panels, ε_r = L/512 ≃ 0.025 pc h⁻¹, which corresponds respectively to about 1/61 and 1/51 of the subcube size in the top right and middle right panels; in the bottom right panel, ε_r = L/512 ≃ 0.05 pc h⁻¹, which corresponds to about 1/82 of the subcube size.