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University oi Minneso.ta, Minneapolis, Minnesota 55455 Giraud eta/. [1972] report on a pair of rocket flights in which radio frequency mass spectrometers were carried to an altitude of 400 km and measurements were made of the neutral constituents N2, 02, Ar, and O. A comparison is made with results obtained for N2 and 0 by the incoherent scatter sounding method. Giraud et al. conclude that their mass speetrometrically determined 02 and 0 densities are seriously in

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