Mean normalized covariance matrix of the mocks, Corr, as a function of for the smallest values of . The top panels are for Δr_⊥ = 0, with the right panel showing only the points with Corr_AB< 0.1. The bottom two panels are for Δr_⊥ = 4 h^-1 Mpc (left) and Δr_⊥ = 8 h^-1 Mpc (right). Shown are the correlations given by the mock-to-mock, by the mean of sub-sampling on each mock set, and, for one set, by the sum of all the diagrams.