Screenshot showing the use of SLIM within MADCUBA to identify and fit a synthetic LTE model to an observed broadband spectrum. In this case, a 30 000 channel ALMA spectrum is displayed where more than 100 molecular species have been fitted. From top to bottom and left to right, the windows shown are: the main ImageJ window; the main MADCUBA menu; the modelling tab within the SLIM tool with the list of fitted species and the sliders in the bottom to interactively adjust the physical parameters; the spectra container window displaying the currently opened spectra; the plot showing the full spectrum with the transitions of the selected species labeled; the SLIM PLOT showing the synthetic model overlaid on top of the observed spectra zoomed to the brightest transitions of the selected species; the list of transitions of the selected species.