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. 2019 Apr 17;7:65. doi: 10.1186/s40168-019-0682-x

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© The Author(s). 2019

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Redundancy analysis based on the abundance of active populations in activated sludge. The left panel is a tri-plot of samples, OTUs, and performance parameters. Stars, hexagons, and diamonds represent samples from the three parallel tanks. Gray scale of the fill color represents time scale of the sampling from February to June. Small dots in the middle represent OTUs, which are zoomed in on the right panel. Size of the circle represents relative abundance in activated sludge. The length of an environmental parameter arrow in the resulting ordination indicates the strength of the relationship of that parameter to community composition