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Fig. 5.

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The direction dependence of the count rates up to 28.6 km altitude measured by ZP1210 GM tubes oriented horizontally and vertically in the BEXUS-14 stratospheric balloon flight. The dashed line indicates 10 km altitude, above this altitude the uncertainties of the ZP1210 values are 2–3% (Zábori et al. 2015b).

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