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Fig. 3

image

Oxygen molecule transmittance in the Earth’s northern hemisphere, from left to right, at Sweden, Greenland, and Canada. Top row: transmittance at ground level, while bottom row: results for an observatory at 35 km above the sea level. Blue designates the transmittance for a reference day time while black corresponds to a reference nocturnal period on 2017 June 15 (see Tab. 1).

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