Time evolution for the initial purely poloidal magnetic field model III with five different EoSs using ζ = 10⁻³, a grid of N_r = 60 radial steps, N_θ = 91 polar steps inside the core, N_Exp = 40 external multipoles, and u = 2/3. The panels show the following variables: (a) Magnetic energy in the NS core, normalized by its initial value. (b) and (c) rms neutron and ambipolar velocity, ⟨v_n⟩ and ⟨v_ad⟩, respectively. (d) The ratio ⟨v_ad⟩/⟨v_n⟩. For each model, the timescales t_ζB and t_ad, and the velocities are evaluated considering the stellar parameters of Table 2. The vertical line marks the dimensionless value of ζ = t_ζB/t_ad, which is fixed to be the same for all EoSs.