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. 2015 Mar 18;2(3):140475. doi: 10.1098/rsos.140475

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© 2015 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Projected trajectories (X(0,t),Y (0,t)) and angles of trajectories $θ := \arctan d Y / d X (s = 0)$ for different sperm numbers as a function of changing the height of the backstep. (a,b) Sp=13, (c,d) Sp=15, (e,f) Sp=17. Colour corresponds to the backstep heights shown in (a,c,e).