Correlation matrix of halo power spectrum with BAM. Top row: Correlation matrix (where C_ij is the covariance matrix) obtained from the BAM mock halo catalogues and the SLICS references computed in real space and redshift space, the latter expressed through the monopole P₀(k), the quadrupole P₂(k), and the hexadecapole P₄(k). Bottom row: Examples of elements of the correlation matrix r_ij at two different wavenumbers k_j ∼ 0.1 and ∼0.32 h Mpc⁻¹ from the two sets of halo catalogues.