Top panel: mean integrated line temperature of ¹²CO(2–1) in K km s⁻¹ (averaged over the area above 5σ in each “slice” of Fig. 5) as a function of distance along the cone axis. The overplotted curve in green is defined by T ∝ z^−4/5. Bottom panel: mass in slices of thickness 30 au as a function of distance along the axis, using our lower limit to T_ex of 30 K. The constancy with z could indicate a steady mass flux rate along the cone walls; see Sect. 4.2.