Top panel: a snapshot of the electron fluid velocity, V_ex, at Ω_ciT = 500. Middle panel: 1D profiles of V_ex, spatially averaged over the y-​​​​direction (black line) and sliced at Y/λ_i = 1020 and 1130 (orange and blue lines), respectively. Bottom panel: 1D profiles of the electron density, spatially averaged over the y-direction (black line) and sliced at Y/λ_i = 1020 and 1130 (orange and blue lines), respectively. The black dashed horizontal line corresponds to the shock compression ratio, r = 3.24.