Multipoles of the CODEX cluster’s power spectrum. The solid lines with error bars show the measurements, and the dashed lines show the corresponding theoretical predictions. The orange lines show the theoretical prediction using the Planck 2018 cosmology, the green lines the prediction using the best-fit cosmology obtained using all the multipoles, and the red lines the prediction using the best-fit cosmology obtained using the monopole alone. Top panel: monopole (ℓ = 0). Second panel: Quadrupole (ℓ = 2) Third panel: hexadecapole (ℓ = 4). Bottom panel: relative difference of the measured and predicted spectra (Planck 2018 cosmology) for monopole and quadrupole. The predicted hexadecapole is close to zero, which makes the relative difference extremely large. The vertical black line shows up to which wavenumbers we include the measurements in our cosmological analysis.