Spatially integrated NOEMA spectra of emission lines from dense-gas tracers binned to 100 km s⁻¹ resolution. Left: best-fit Gaussian functions obtained with the mpfit algorithm for all transitions detected at > 3σ (blue curves), together with the continuum. Middle and right: profiles of individual lines compared with those of ¹²CO(4–3) (blue lines). CO spectra are rescaled arbitrarily and shifted according to the best spectroscopic redshifts from C18. For PLCK_G244.8+54.9, the continuum-subtracted spectra of HCN(5–4) and HCO⁺(5–4) were also fitted with two Gaussian components by fixing the peak velocities to those measured for CO lines (C18). The best-fit line profiles are plotted as red curves and individual spectral components are overlaid as gray curves.