Figure 4: The histograms of pairwise genetic distances (p-distances) between the representative sequences of a 95% major OTU pool.
From: The effect of 16S rRNA region choice on bacterial community metabarcoding results

(a) V2-V3 fragments 16S rRNA, red line - average distance. (b) V3-V4 fragments 16S rRNA, blue line - average distance.