Comparison of the total velocity field power spectra. The top and bottom rows present spectra computed from 5 and 1 Mpc square maps, respectively. The left column presents the total velocity field power spectra in slices in the background filament, that is, from red to black at Δx_cen = { − 8, −6, −4, −2} Mpc, and in the Virgo core for comparison. The right column presents the total velocity field power spectra in slices in the foreground filament, that is, from black to blue at Δx_cen = {2, 4, 6} Mpc, and also in the Virgo core for comparison. For comparison, we show the slopes predicted by Kolmogorov’s (P(k)∝k^−11/3) subsonic turbulence theory and Burgers’ (P(k)∝k⁻⁴) supersonic turbulence theory.