Theoretical predictions of the suppression of the total matter power spectrum in non-standard N_eff cosmologies with respect to the standard one, at z = 0, and assuming fixed values of {Ω_m, 0, Ω_b, 0, h}, like in the top panel of Fig. 2. The colour coding of the theoretical predictions is the same as in Fig. 3. We add here two more prescriptions, obtained by rescaling Ω_c, 0, Ω_b, 0 and h to mimic changes in N_eff. We refer to it as “ΛCDM equivalent”: the dot-dashed pink line represents results for EuclidEmulator2; and the dotted cyan line represents the BACCOemulator prediction. Black crosses represent results from N-body simulations.