Transverse velocity profiles for different values of (a) Hartmann number (Ha), (b) Grashof number (Gr), (c) heat source parameter (β) and (d) Jeffrey fluid parameter (λ₁) for fixed values of M = 2, a = 0.2, a₀ = 0.2, k₀ = 9.95, t = 0.25, x = 0.5