Longitudinal pv diagrams perpendicular to the disk, starting at x = 1.5″ (top left) to x = −1.5″ (bottom right). The black cross shows the central position of the disk at x = 0″ and the v_lsr of HH30 at 6.9 km s⁻¹. The contour levels start at 5σ with 5σ steps, with σ = 2.0 Jy beam⁻¹. The orange ellipse in dashed line highlights the high-velocity component seen at y ∼ 0.25″ from x = −0.2″ to x = +0.2″. See text for more details.