The velocity and volume density distributions with P_SB = 22 GPa are displayed for supported waves in panels (b) and (c) and unsupported waves in panels (e) and (f). The snapshots in panels (a) and (d) are the corresponding atomic images, in which yellow represents the source of the ejected particles within the jets. The dashed line separately denotes the jet bottom and its tip, where velocities are marked by V_b and V_s.