Correlation matrices for the combined monopole-quadrupole data vector in the low- (top) and high- (bottom) redshift bin. Correlation matrices are computed as , where C is the covariance matrix estimated from a set of 153 independent mock samples. The bottom left and top right squares correspond to the auto-covariance of the monopole s²ξ⁽⁰⁾ and the quadrupole s²ξ⁽²⁾, respectively, while the remaining squares show the cross-covariance terms. The scales under consideration range from s_min = 5 h^-1 Mpc to s_max = 50 h^-1 Mpc (from left to right).