α = arctan(−⟨v_r⟩∕⟨v_ϕ⟩ (blue lines inthe top panels) and magnetic field strength |B| (red lines in the bottom panels) over radius from the central star for five cosmic-ray ionization rates: ζ = 10⁻¹⁸ s⁻¹ (dark solid lines), ζ = 5 × 10⁻¹⁸ s⁻¹ (dash-dotted lines), ζ = 10⁻¹⁷ s⁻¹ (dashed lines), ζ = 5 × 10⁻¹⁷ s⁻¹ (dotted lines), and ζ = 10⁻¹⁶ s⁻¹ (light solid lines). The lighter the color, the higher the ionization rate. The left plots show the radial profiles at t ≈ 5 kyr, and the right panels at t ≈ 16 kyr for the combination of λ = 4.8 and β = 0.025.