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Gas samples are withdrawn from the enclosed space between the collar and cap right after the cap is put on, and again after 20 minutes. The two samples are then analyzed to determine the change in gas composition over time (the flux). Petsikko wetland, south of Kevo Research Station, Finland.

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Photo by Abby Miller, Courtesy of Carol Scott (PolarTREC 2013), Courtesy of ARCUS
Photographer: Abby Miller
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