Fig. 1
From: GeFaST: An improved method for OTU assignment by generalising Swarm’s fastidious clustering approach
Schematic view of Swarm’s clustering strategy. a Starting from a seed, amplicons are added iteratively using a small local threshold t until the OTU reaches its natural limit when no more amplicons can be connected to it. b By postulating the existence of virtual linking amplicons, light OTUs are grafted onto heavy ones during the fastidious clustering step. Adapted from [8, Figure 1]