Reconstructed relative power spectrum, f_δ(k, z), in redshift range 0 ≤ z < 2 using a verification data vector mimicking KiDS-1000 data (noise added, not marginalising IA or lensing kernel errors). The true relative power has f_δ ≡ 1 for all scales and redshift. The data vector is computed from an independent code, not based on the projection matrix X^(ij)(θ; m, n). Shown is the posterior median within a 68% CI. The reconstructions use a Tikhonov parameter of τ = 5.0 and N_k = 20 k-bins. Left panel: The relative power is averaged over the entire redshift range Z₁ = [0, 2]. Middle panel: For a relative power that is averaged independently for three redshift bins Z₁ = [0, 0.3], Z₂ = [0.3, 0.6], and Z₃ = [0.6, 2]. Right panel: Dimensionless average power spectrum, Δ²(k, z) = 4π k³P_δ^fid(k, z) f_δ(k, z), interpolated to the centres of the redshift bins Z₁ to Z₃.