What are the numbers in `taxa barplot` CSV file?

Hi @Toan,
The values in the CSV file from qiime taxa barplot are read counts for each taxon.

If you are hoping to obtain relative abundance values that correspond to the bars shown in the barplot, see this post. We have an open feature request here to add download of relative abundance values so a one-click approach may be available in the future (for now see the commands listed in that other post).

I hope that helps!