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The APE-THESEO campaign was held from 15 February to 15 March 1999 from the Seychelles in the western Indian Ocean. APE-THESEO stands for ‘Airborne Platform for Earth observation — (contribution to) the Third European Stratospheric Experiment on Ozone’. The campaign aimed to study processes controlling the low water content of the stratosphere, including the mechanisms of cloud formation in the tropical...
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