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 angular correlation. There are eight angular bins, over 1.25 < r < 50 arcmin, equally spaced in log (θ), as in previous figures. We consider halos in the redshift range 0 < z < 0.8, with an angular window of 400 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 (93) for the Peebles & Hauser estimator. Middle panels: low-order contributions (94) for the Landy & Szalay estimator. Right panels: full correlation matrix, including the high-order contributions of Eqs. (96)–(98), for the Landy & Szalay estimator.