Density fields in 256 × 256 × 0.5 h⁻¹ Mpc slices of the L256 model at identical z-coordinates. Left panel: density field smoothed with the kernel of radius 1 h⁻¹ Mpc in density interval 0.005–15 in mean density units; the colour code below corresponds to this field. Middle panel: same density field in density interval 1.5–15 in mean density units. Faint filaments between high-density knots are invisible. Right panel: field smoothed with kernel 8 h⁻¹ Mpc in interval 1.5–15 in mean density units. Filaments are thicker and percolate easier. In all panels densities are expressed in logarithmic scale.