Power spectrum ratio Δ_KiDS²(k, z)/Δ_Planck²(k, z) at z = 0.5. Shown in grey are the 68% and 95% CI from our analysis. The KiDS-1000 spectrum Δ_KiDS²(k, z) uses the f_δ, mn in Fig. 4 averaged within one broad redshift bin (left panel). The Planck model for Δ_Planck²(k, z) is the TT, TE, EE+lowE best fit of a standard ΛCDM (Planck Collaboration VI 2020) extrapolated to z = 0.5 with HMCode2020 by Mead et al. (2021). The lines are model transfer functions to Δ_Planck²(k, z) invoking flavours of extreme baryonic feedback (HMCode2020: log₁₀(T_AGN/K) = 8.8, A_baryon = 3.13, η_baryon = 0.603; BCM by Schneider & Teyssier 2015: log₁₀(M_c/h⁻¹ M_⊙) = 15.0792, η_b = 0.5, k_s = 55.0), neutrino suppression for cumulative neutrino masses ∑_νm_ν (BCM), or a mixture of CDM and WDM (Kamada et al. 2016, m_wdm: WDM particle mass, f_wdm: WDM mass fraction).