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Fraction of bulk sediment OTU0.97 richness shared by data sets from pools of SSGs. Depicted values based on consecutively pooled SSGs in decreasing order (▪) or increasing order (▴) of their individual OTU0.97 richness. For bacterial diversity indices of individual sand grains see Supplementary Table S2. Subsampling of SSG data sets and bulk sediment data sets were done in a way that always identical number of sequences were compared.
