Correlation matrix computed from the combined γ-2PCF and 1D M_ap DVs with five tomographic slices and including cross-terms. ξ_± is ordered by increasing redshift from ξ_±(z₁), ξ_±(z₁, z₂), …, to ξ_±(z₅). 1D M_ap is ordered by increasing size of the combination of slices: M_ap(z_i), …, M_ap(z_i ∪ z_j), …, M_ap(z_i ∪ z_j ∪ z_k), …, M_ap(z_i ∪ z_j ∪ z_k ∪ z_l), …, M_ap(z_all). The lower correlations between the two probes indicate a potential gain of cosmological information from their combination.