Along the constant-τ curve [the region of black shading in Fig. (a)], the area of smallest discrepancy between the quantum dynamics-and FEM-calculated inclusion dipoles (ω ∼ 1.0%, indicated by the smallest, yellow circles) corresponds to very similar, high permittivities for both the inclusion and interface relative to the matrix (ε inc ∼ 100; ε int ∼ 300;