Color maps for each asymmetry parameter (top: a₁₁, middle: a₂₁, bottom: a₂₂) for a co-aligned quadrudipole (β_d = β_q = β). The solid (dashed) overplotted contours emphasize the values of the asymmetry parameters. Only |ℛ| are shown since a_ℓ|m| are functions of ℛ². There is a symmetry relation of a_ℓ|m|(90° −β) = a_ℓ|m|(90° +β) intrinsic to Eqs. (24)–(26); therefore, we limited β to the interval [0° ,90° ]. Left panels: ℓ = 1, 2 theoretical degeneracy for a magnetic field of the case (a) in Fig. 1. Middle panels: same degeneracy computed with magsplitpy. Right panels: Absolute difference between the numerical calculations and the analytical expressions of the asymmetry parameters.