Ratio of the magnetic shifts produced by the prograde sectoral modes, ℓ = 2, m = −2 and ℓ = 1, m = −1, of the same radial order, n, as a function of their spin parameters, s_1, −1 (lower x axis) and s_2, −2 (upper x axis). The ratio was computed for three different angles of an inclined dipolar field, β = 0° (blue), β = 47° (green), and β = 90°. The ratio of the product, F(s)s³, which does not depend on the field topology, is also displayed (black).