Ratio of the EdS approximation to the exact calculation of the redshift space matter power spectrum multipoles, computed with the TNS prescription, for the Dark Scattering model with equation of state of dark energy described by the CPL parametrization (see Eq. 11) with w₀ = −1.1 and w_a = 0.3 (denoted CPL2 in the text, see Table 2), and at redshift z = 1. Blue solid, orange dashed and green dotted lines denote the monopole, the quadrupole and the hexadecapole ratios, respectively. In the top-left, bottom-left and bottom-right panels, we use σ_v = 5.2 h⁻¹ Mpc and ξ = 50 bn GeV⁻¹, ξ = 30 bn GeV⁻¹ and ξ = 10 bn GeV⁻¹, respectively. In the top-right panel, we use σ_v = 5.14 h⁻¹ Mpc in the EdS prediction, which is the value obtained by refitting to the exact calculation which uses σ_v = 5.2 h⁻¹ Mpc. Blue and beige bands indicate errors on the monopole and quadrupole assuming a ΛCDM Gaussian covariance with V = 8.8 h⁻³ Gpc³ and no shot noise contribution (we compare dark matter multipoles). We note that the hexadecapole error fills the plot and so we have omitted it.