The mean correlation, from Eq. (58), over ten comoving distance bins within 5 < r < 100   h^-1 Mpc, equally spaced in log (r). We integrate over halos within the redshift interval 0 < z < 1, for the XXL, DES, and SPT surveys, as in Fig. 28 (again the error bars for SPT are slightly larger and shifted to the right with respect to those of DES, for M > 5 × 10¹⁴   h^-1   M_⊙). The error bars show the diagonal part of the covariance, , for the Landy & Szalay estimator, from Eqs. (69) and (75)–(77).