Profiles of azimuthal velocity anisotropy β_ϕ of the atomic gas in M 33 at different angular resolutions. Solid lines show the anisotropy profiles obtained assuming σ_z = ⟨σ_los⟩_ϕ and a null thermal component. Short-dashed lines show the ±1 rms errors; a dotted line is an illustration of result choosing another vertical dispersion, σ_z = 4 km s⁻¹ (70 pc resolution only); and a blue long-dashed line is the velocity anisotropy profile expected from the epicycle theory (Sect. 5). Shaded areas are as in Fig. 4.