Impact of cosmic variance on P_3D (top panel) and P_1D (bottom panel) measurements from our simulations at z = 3. Lines show the difference between measurements from the CENTRAL and SEED simulations, which only differ on their initial distribution of Fourier phases, divided by $\sqrt{2}$ times their average. Cosmic variance induces errors as large as 10% on P_3D for k ≃ 0.3 Mpc⁻¹, while these are on the order of 1% for P_1D.