Difference between the predicted and TNG monopole (top block) and quadrupole (bottom block) of the redshift space cross-correlation function between the test half of the box and the whole box. We show three models with different numbers of subhalo properties. We tested two redshifts, z = 0 (left) and z = 1 (right), and two number densities for each statistic (n = 10⁻² h³ Mpc⁻³, upper panel of each block, and n = 10^−2.5 h³ Mpc⁻³ lower panel). The grey-shaded intervals mark the 1σ regions. The yellow-shaded region (r < 0.316 h⁻¹ Mpc) is not used to compute the χ² (see Appendix B).