Specific angular momentum ( j = R × V_ϕ) versus poloidal velocity V_P for steady and axisymmetric MHD disk winds. The black symbols represent values derived from the tomography and averaged along lines of constant V_Z, with their uncertainty. Red curves show the expected relation from self-similar cold magneto-centrifugal disk winds with r₀ varying from 0.5 to 100 au and λ between 1.52 and 2.3 from Ferreira et al. (2006). The green dot corresponds to a warm MHD disk wind solution from Casse & Ferreira (2000) with r₀ = 1 au and λ = 1.9. The green arrow shows the path followed by the solution with an increase of r₀. The gray box represents the estimated specific angular momentum for the outer low velocity layer on Sect. 4.1, taking a maximal poloidal velocity corresponding to a height of Z = 3300 au in the outflow referential.