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The Microwave Limb Sounder (MLS) instrument is a small satellite-borne radio telescope. Its purpose is to make limb-scanning measurements of atmospheric composition. One of the gases to which it is sensitive is carbon monoxide (CO), detected via the J=2→1 rotational transition at 230GHz. CO is present in molecular gas clouds in the Milky Way. Although it was not designed for the purpose, MLS can detect...
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