Difference between the emulator prediction and the real mock weighted by the scaled TNG300 error for the highest number density ($\overline{n}={10}^{-3}{h}^3{\mathrm{Mpc}}^{-3}$) at z = 1. Error bars mark the 68% intervals of the distribution of the emulator predictions. We plot 800 randomly selected lines in grey. We include in orange the contribution to the total uncertainty (σ) of the 5% of the TNG300 signal. The total uncertainty (including the JN samples) is marked with a blue-shaded region to aid visual presentation.