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. 2014 Sep 7;281(1790):20140296. doi: 10.1098/rspb.2014.0296

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© 2014 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Schematic of the average velocity (VSL) and speed (VCL). VSL is calculated by dividing the distance between the initial and final position in a sperm trajectory (dashed line) by the time Δt employed to move; VCL is found by dividing the length of the actual curvilinear trajectory (solid line) by Δt. (Online version in colour.)