Top panel: phase shift Δϕ between fluctuations in the baryons and DM as a function of redshift for modes with k = 200, 100, 40, 20 Mpc⁻¹, assuming a stream velocity v_bc = 1σ_vbc and θ = 0. Middle panel: comoving spatial separation between baryons and DM (solid lines) and comoving virial radius of the DM halo (dashed lines). Bottom panel: similar to the middle panel, but shows the physical spatial separation.