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. 2022 Sep 5;8(1):13. doi: 10.1038/s41514-022-00094-x

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Fig. 4 — a, b Trajectory comparison between ARM and LEG of the ankle joint angles. The stepping leg is the leg that steps out first. c, d Trajectory analysis: t tests were performed for every time sample. The level of significance is visualized as the negative base-10 logarithm of the p value so that large values represent small p values; black dashed horizontal line indicates a significant difference (p < 0.01).