CO bias-weighted intensities as function of redshift. The color-code stands for the transitions’ J_up from 1 to 8. Solid lines and shaded areas correspond to the mean and 1σ dispersion, respectively, on the measured bias-weighted intensities from the 12 9 deg² fields. Black dotted stars show the mean brightness derived analytically times the SIDES effective clustering bias $b_{\mathrm{eff}}^{\mathrm{fit}}$. The last panel in the left column shows the relative difference between the simulation-based and analytic bias-weighted intensities (i.e., the relative difference between colored lines and stars).