The accuracy of our model and our simulations at redshifts z = 0.35, 1, and 3, for the density two-point correlation. The green solid line is the relative difference between the model and the simulations, from Eq. (61). The dashed line that grows at large x is the relative statistical error (46) of the simulations, while the dashed line that grows at small x is the relative shot-noise error.