Zoom into the background (top) and foreground (bottom) filaments in the longitudinal cut. The maps are 11.061 × 12 Mpc large with the same resolution as those presented in Fig. 1. The left panel shows the Mach number, the central panel shows the electron density-weighted divergence, and the right panel shows the z component of the electron density-weighted vorticity. The Virgo R₅₀₀ and virial radius, R_vir, are shown as black circle arcs on each map.