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Relative abundance of taxa (16S rRNA gene Illumina barcodes) as a function of depth in mature thermoacidic iron oxide mats from One Hundred Spring Plain (A) and Beowulf (B) Springs. The top position refers to the upper 1 mm oxygenated zone, the middle position represents depths of ~2–7 mm, and the bottom position represents hypoxic regions > 10 mm.
