Top panel: Growth rate, σ_r, normalised by Ω in the (Pm, Λ_Z) plane of the axisymmetric SMRI, for a regime typical of DNS. See details in Table 1, with Ro = −0.05, (N/Ω)² = 1, Λ_ϕ = 0. The three dashed lines correspond respectively to the three criteria Equation (9). The blank region corresponds to the stable parameter domain. The dotted lines correspond to Λ_Z, L, Λ_Z, U, from the Eq. (12), when Λ_Z, U > Λ_Z, L. Bottom panel: Growth rate, σ_r, normalised by Ω in the (Pm, Λ_Z) for a regime of radiative stellar region (see Table 1, with Ro = −0.05, (N/Ω)² = 10, Λ_ϕ = 0).