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. 2022 May 25;32(12):8597–8607. doi: 10.1007/s00330-022-08866-5

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Fig. 6 — Relationship between age and the helix forward velocity (V_for) (m/s), showing a strong trend to decrease with age. The grey dotted lines mark the 2.5% and 97.5% percentiles; the grey solid lines mark the median