I do not understand the log Relative abundance plots? How they are in negative?

15 February 2021 0 4K Report

Article A Human Gut Microbial Gene Catalogue Established by Metageno...

So to clarify, I am talking about graphs like figure 3 in this paper. I have encountered them quite frequently, and I always struggle to understand them. I am not very good at statistics, so please help.

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