Spectrum towards G328.2551-0.5321 between 252 GHz and 258 GHz. The filled grey histogram shows the spectra, and the coloured labels show the detected transitions of all the light molecules and some transitions of the COMs. The green line represents the LTE model obtained with Weeds. The upper panel for each frequency range shows the labels for the small molecules, and the lower panel corresponds to a zoom in temperature for better visibility of the COMs which are label.