Color maps for each theoretical asymmetry parameter (top: a₁₁, middle: a₂₁, bottom: a₂₂) for different values of ℛ. The solid (dashed) overplotted contours emphasize the values of the asymmetry parameters. Only the positive values of ℛ are shown since a_ℓ|m| are functions of ℛ². There are symmetry relations of a_ℓ|m|(ℛ, 90° −β_d, β_q) = a_ℓ|m|(ℛ, 90° +β_d, β_q),a_ℓ|m|(ℛ, β_d, 90° −β_q) = a_ℓ|m|(ℛ, β_d, 90° +β_q) intrinsic to Eqs. (28)–(30); therefore, we limited β_d and β_q to the interval [0° ,90° ]. From left to right, the figure shows how the theoretical a_ℓ|m| vary with increasing |ℛ|.