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. 2020 Mar 17;10:4852. doi: 10.1038/s41598-020-60878-7

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© The Author(s) 2020

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Absolute numerical error for 16-point chirp contours, shown as a function of the polar angle of W, discretized at 360°/2048. Each point represents the average error for ten random input vectors, each of unit length. The three red points indicate the errors for the three chirp contours shown in Fig. 1.