Ratio of the USA and EdS approximation to the exact calculation of the redshift space matter power spectrum multipoles, computed with the TNS prescription, for the |f_R0| = 10⁻⁵ (F5) model at redshift z = 1. The models assume the fits as found in Table 3. The dotted lines show a USA and EdS prediction where the nuisance parameters are not refit to the simulation data, and take the same values as the exact computation. Blue and beige bands indicate errors on the monopole and quadrupole assuming a Euclid-like Gaussian covariance with V = 8.8 h⁻³ Gpc³ and $\overline{n}=6.86\times {10}^{-4}{h}^3{\mathrm{Mpc}}^{-3}$.