GoF test for the bias 2PCF and 3PCF models with fixed cosmological parameters as a function of the minimal scale, $r_{\min }^{2\mathrm{PCF}}$ and $r_{\min }^{3\mathrm{PCF}}$, respectively, assumed for the analysis. The posterior-averaged χ² is compared to the 68% and 95% confidence intervals for the χ² distribution, denoted by the grey shaded areas, given the corresponding N_d.o.f. (fixing the case η_min = 1 for the 3PCF confidence levels; see the main text for more details). For the 3PCF, we considered three different values for the η_min parameter, Eq. (40), progressively excluding near-isosceles configurations. In the joint analysis, the minimal scale for the 2PCF was kept fixed at $r_{\min }^{2\mathrm{PCF}}=25h^{-1}\mathrm{Mpc}$, with the results shown as a function of $r_{\min }^{3\mathrm{PCF}}$ alone. The four columns span the four simulation snapshots at redshifts (z) of 0.9, 1.2, 1.5, and 1.8.