Normalised differential rotation along a poloidal field line ΔΩ_pol/Ω₀ as a function of (Re_cP_m/L_u)². This quantity is estimated between two sufficiently separated points along a field line for the runs D8 and, D10–D14 of Table 1. The correspondences between parameters and symbols are as follows: circle: Re_c = 10⁻¹, L_u = 10⁴; triangle: Re_c = 5 × 10⁻¹, L_u = 5 × 10³; diamond: Re_c = 5 × 10⁻¹, L_u = 10⁴; square: Re_c = 1, L_u = 5 × 10³; pentagon: Re_c = 1, L_u = 10⁴; hexagon: Re_c = 2, L_u = 10⁴. The other parameters are E = 10⁻⁴, P_r(N₀/Ω₀)² = 10⁴, and P_m = 10².