Correlation matrix of f_δ, mn errors for the KiDS-1000 analysis with three redshift bins, corresponding to the middle and right panels in Fig. 4. The three blocks on the diagonal from bottom left to top right are the correlation matrices for the z-bins Z₁ = [0, 0.3], Z₂ = [0.3, 0.6], Z₃ = [0.6, 2], respectively; off-diagonal blocks show correlations between distinct z-bins; pixels within the 20 × 20 blocks are correlations between the k-bins, ascending from left to right inside a block.