For cluster_otus, this field is otu, match or chimera.
For uparse_ref, it is perfect, good, noisy, chimera or other.
|3||Percent identity between the query sequence and the top hit in the reference database. With cluster_otus, the reference database is the current set of OTUs. If no hit was found, this field is set to *,
|4||Percent identity between the query sequence and the maximum parsimony model. If no model is made, e.g. because the database is empty, then this field is set to *.
|5||OTU label(s). If the model is chimeric, then the labels and start-end segment coordinates are given. Otherwise, the label of the reference sequence. For cluster_otus, this will be the label of an existing OTU. If no model is constructed, this field is set to *.
Even1.7;size=4383; otu * * OTU_1
Even1.145;size=21; otu * * OTU_2
Even1.1733;size=20; match 99.5 * OTU_2
Even1.942;size=20; chimera 94.0 100.0 OTU_1(1-141)+OTU_2(142-200)
Even1.1821;size=20; match 98.5 * OTU_1
Even1.1415;size=19; match 97.0 * OTU_2