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. 2020 Feb 3;15(2):e0228209. doi: 10.1371/journal.pone.0228209

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© 2020 Nguyen et al

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

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Fig 4 — Experimental bin-averaged (a) area-based shape factor b, and (b) perimeter-based shape factor c of microbial-associated MP aggregates as a function of the attached biological fraction f_b; error bars represent standard deviation in each bin. (c) and (d) scatter of the shape factors b and c of microbial-associated MP aggregates over aggregate size L for three ranges of f_b from the main experiment. (e) and (f) scatter of the shape factors b and c of virgin MP particles over particle size L from the MP-only sample. b_L and c_L were the shape factors calculated as a function of L as in Eqs 12 and 13.