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. 2021 Jun 8;44(6):76. doi: 10.1140/epje/s10189-021-00078-x

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 7 — Helical trajectories for selected parameters of the metachronal beat, with phase lag $χ = + 105^{\circ}$ . Trajectory colors indicate the latitudinal wave number, with $k_{φ} = 0$ blue, $k_{φ} = 1$ orange, $k_{φ} = 2$ green, and $k_{φ} = 3$ red. The small (body-fixed) arrows have their tip in the body center and their base on the equator to indicate rotation around the main body axis