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Title
Gravitational separation suggested by O<sub>2</sub>/N<sub>2</sub>, δ<sup>15</sup>N of N<sub>2</sub>, δ<sup>18</sup>O of O<sub>2</sub>, Ar/N<sub>2</sub> observed in the lowermost part of the stratosphere at northern middle and high latitudes in the early spring of 2002