Left: Functions ℱ₀, ℱ₂, ℱ₄, and 𝒢₀ defined in Eqs. (37) and (38) for our observational setup, assuming σ = 3 h⁻¹ Mpc and a spectral resolving power of R = 100 (top panel) or R = 500 (bottom panel). The dash-dotted lines represent the analytic approximations given in Eqs. (39) and (40), with colours matching those used for ℱ₂ and ℱ₄, respectively. Right: Individual components of the LIM power spectrum entering Eq. (36) for our pessimistic luminosity function with α = −1.1 (similar results are found for other LF assumptions).