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. 2022 Jul 1;60(8):2133–2157. doi: 10.1007/s11517-022-02609-w

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Fig. 4 — Lateral bending synthesised weighted mean stiffnesses for each quartile with confidence intervals. The area demarcated by lightest grey represents 90% confidence interval. The area encompassing the two lightest greys represents the 95% confidence interval. The three grey regions combined represent the 99% confidence interval. Nm/°, Newton metres per degree