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. 2020 May 1;11:2139. doi: 10.1038/s41467-020-15975-6

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 3 — a Graph of the Hersey number at which each group transitions from boundary mode to mixed mode lubrication (left y-axis and green bars). The COF at the time each lubricant transitions from boundary to mixed mode lubrication (right y-axis, black symbols). Error bars represent standard deviation, N = 3 replicates; one-way ANOVA used to compare groups, statistical differences indicated by asterisk, where *p < 0.05, **p < 0.01, ****p < 0.0001. For full list of statistical results see Supplementary Information. b. Stribeck curves for best preforming mega HPG (mega HPG-3) at both 7 and 23 w/v%, as well as two controls, BSF and Synvisc One. Error bars represent standard deviation, N = 3 replicates.