The ratio of the nonlinear power spectrum P(k) to a “no-wiggle” linear power spectrum P_Ls(k), as in Fig. 10, at redshifts z = 0.35, 1, and 3. The red dot-dashed lines “P_Mat” correspond to the use of the Lagrangian-based 1-loop expansion (53) for the term P_pert in the 2-halo contribution (27), whereas the blue solid lines “P_mZ” correspond to the use of the “modified Zeldovich” expansion (56). The 1-halo term is the same as the one used in Sect. 5.