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A further flight of the balloon-borne pressure-modulated radiometer (PMR) instrument (see Chaloner et al. 1978) is described when simultaneous measurements of NO and NO2 concentrations were made through dawn. A detailed description of the retrieval methods used and the precautions taken against interference from signals from other gases is given. Profiles of NOx through dawn are also briefly considered.
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Drummond et al. (1978) studied this question.
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