Fig. 2: Quality and taxonomic diversity of viral operational taxonomic units (vOTUs) identified in this study.

a Histogram of the contig lengths of vOTUs. Red indicates that the vOTUs were novel compared with the IMG/VR database; blue indicates that the vOTUs clustered with contigs in the IMG/VR database, whereas they were more complete; yellow indicates that the vOTUs were found in the IMG/VR database with equal or lower completeness. b Taxonomic affiliation of predicted vOTUs comparing with the NCBI viral reference database using the lowest common ancestor algorithm.