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. 2019 Mar 14;9:4564. doi: 10.1038/s41598-019-40350-x

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© The Author(s) 2019

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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The upper waveforms in all the graphs are the raw data. The lower waveforms are the corresponding approximations which have been shifted down for visual convenience. The bottom lines represent the absolute value of the difference between the raw data and the approximation. The top left graph corresponds to segment 25 in record 101 and the right one corresponds to segment 120 in the same record. The bottom graphs have the same description as the top graphs but for record 213 and segment 175 (left) and 51 (right).