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. 2020 Feb 19;10:2898. doi: 10.1038/s41598-020-59821-7

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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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Empirical frequency distribution of non-QRS peaks height, width, and prominence in lead II. The Y-axis presents the frequencies of height, width and prominence, and X-axis presents the scale that measures height, width and prominence of non-QRS peaks. The unit step of X-axis is (the maximum of height, width or prominence - the minimum of height, width or prominence)/100.The frequencies shown in the rows named SR, AFIB, GSVT, and SB were computed from ECGs presented in Figs. 10,11,12,13 respectively. The full demonstration for feature extraction from 12 leads ECG can be found in Supplementary section B.