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. 2022 Jun 27;12:10862. doi: 10.1038/s41598-022-14458-6

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© The Author(s) 2022, corrected publication 2023

Open Access This 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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Localization errors for the sensor positions obtained with photogrammetry and Polhemus for the head phantom. Boxplots represent the distribution of the errors across sensor positions, separately for each employed smartphone for the photogrammetry-based method (on the left) and for each operator for the Polhemus (on the right). Bottom and top edges of the box indicate the 25th and 75th percentile, whereas the central mark indicates the median. Outliers are depicted as dots.