Legendre multipoles of the redshift-space power spectrum of galaxy clustering, P_ℓ(k), as expected from the spectroscopic survey data within four redshift bins (respectively, 0.9 < z < 1.1, 1.1 < z < 1.3, 1.3 < z < 1.5 and 1.5 < z < 1.8, where the P_ℓ(k) are evaluated at the mean of the redshift intervals). The plots show the monopole (ℓ = 0, solid line), quadrupole (ℓ = 2, dashed-dotted line), and hexadecapole (ℓ = 4, dashed line), together with their error corridors (shaded regions). The latter simply connect the 1-σ errors from the diagonal values of the analytical covariance matrix, computed for narrow bins of Δk = 0.0017 h Mpc⁻¹. As a result of this fine binning, the shaded areas do not fully reflect the actual constraining power of the measurements.