Variation of the ring parameters and their 1 σ error bars derived from fitting the transverse pv diagrams, as a function of the distance z above the disk plane. Top left panel: symbols show the CO ring radius as a function of z. The red line shows a linear fit giving a semi-opening angle of 35 ± 1^∘. The radii increase linearly consistent with a conical geometry down to z = 15 au. The dashed green line locates the expected inner radius of the disk at r = 37 au in the binary scenario from Estalella et al. (2012). The dotted line plots the atomic jet radius derived from HST observations by Hartigan & Morse (2007). Top right panel: variation of the ring centre displacement with respect to the continuum central x position, as a function of z. Bottom left panel: variation of V_cent (Black symbols) and V_r × sin i (Green symbols) as a function of z. Error bars include uncertainties on the source V_lsr. Negative values of V_cent correspond to blue-shifted emission with respect to V_lsr. Bottom right panel: Variation of V_ϕ × sin i as a function of z. A consistent positive rotation signature in the same sense as the disk is detected in the central z ≤ 250 au of the flow.