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The Submillimetre Wave Instrument (SWI) on ESAs JUpiter ICy moons Explorer (JUICE) is the first deep space submillimetre wave heterodyne spectrometer for planetary exploration.It will investigate the stratosphere of Jupiter as well as the atmospheres/exospheres and surfaces of the Galilean satellites in two submillimetre wave bands covering the frequency range of 530 GHz to 625 GHz and 1080 GHz to 1275 GHz.