Dependence of the critical unpairing field H_c2 on baryonic density (solid line). The density is normalized to the nuclear saturation density n₀ = 0.16 fm^-3 and the equation of state and composition of matter is the same as in Sinha & Sedrakian (2015a). This arrangment of flux-free and flux-featuring phases arises in the case of intermediate field magnetars with average constant field B<H_c2, which is indicated by the dashed line.