Contour plots for the correlation matrix ℛ_i,j, defined as in Eq. (46) but for the full covariance matrix C_ij of the halo correlation. There are ten distance bins, over 5 < r < 100   h^-1 Mpc, equally spaced in log (r), as in previous figures. We consider halos in the redshift range 0 < z < 0.8, within an angular window of 50 deg², above the mass thresholds M > 2 × 10¹³   h^-1   M_⊙ in the upper row, and M > 10¹⁴   h^-1   M_⊙ in the lower row. Left panels: low-order contributions (67) for the Peebles & Hauser estimator. Middle panels: low-order contributions (69) for the Landy & Szalay estimator. Right panels: full correlation matrix, including the high-order contributions of Eqs. (75)–(77), for the Landy & Szalay estimator.