Fig. 5. (a and b) Pressure gradient ((a) for G_r = 0.32, (b) for b_i = 0.3); other fixed parameters are ε = 0.11, r = 0.32, r₁ = 0.22, B = 0.2, λ = 0.08, k = 0.44, s = 0.24, q = 0.5, φ₁ = 0.2, φ₂ = 0.05.