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Oxygen profiles made at three different iron mats at TFS. The zero depth is the air-water interface, and the black bars represent the approximate surfaces of the iron mat beneath the water surface. The blue profile is from the Toolik Lake seep station, the green profile is from the Kuparuk River seep, and the red profile is from a mat close to the sediment layer in a wet sedge meadow near site BW1. See the text for details.
