Reduced χ² for the fit of the redshift space matter power spectrum multipoles, computed with the TNS prescription, to the one from numerical simulations, as a function of k_max and at redshift z = 1. In the top panel we consider the DGP ELEPHANT simulations, in the middle panel the f(R) ELEPHANT simulations, and in the bottom panel the Dark Scattering DAKAR simulations. Crosses indicate the exact computation while circles indicate the EdS and USA approximations. For the f(R) models, the ΛCDM-scr approximation is shown as pentagons. The ΛCDM case is shown as grey squares. The error bars are the 1σ errors on the χ² statistic with N_d.o.f. = 2N_k − 1 degrees of freedom, where N_k are the number of wave modes used in calculating χ². We subtract one because the TNS model has one degree of freedom.