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. 2018 Jan 16;32(6):2994–2999. doi: 10.1007/s00464-018-6023-5

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Fig. 2 — TOP ROW: A path, unscaled (x, y) for an 18-s period and BOTTOM ROW: the same path scaled for camera movement (x′ and y′). LEFT: 2-dimensional visualisation of the measurements; RIGHT: 3-dimensional visualisation (x(′), y(′) and time) of the measurements