Density (left) and radial velocity (right) fields around three halos of mass M₂₀₀ = 8.7·10¹², 9.92·10¹³, 3.97·10¹⁴ h⁻¹ M_⊙ and radius r₂₀₀ = 0.50, 1.12, 1.77 h⁻¹ Mpc, from top to bottom. Figures 6a and 6b display the respective dark matter and gas fields of the fiducial (fgas) run. The panels show a region of ±10r₂₀₀ around the halo centre, projecting a slice of thickness 4r₂₀₀ in the z direction. The white circles represent a 5r₂₀₀ radius. Positive (negative) radial velocities are shown in blue (red).