Each point denotes the reduced fluxes for a single taxon
in a single sample. If two points are close to each other they consume
(for direction="import") or produce (for direction="export") the same
metabolites.
Hover over each point to see its annotations. You can click a point
to select only that taxon. Click on an empty part of the plot to
reset the selection.
Use the "..." menu in the
upper right hand side to export the plot into various formats.