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. 2021 Jun 24;6(2):e26332. doi: 10.2196/26332

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©Henry Fu, Bernie Garrett, Gordon Tao, Elliott Cordingley, Zahra Ofoghi, Tarnia Taverner, Crystal Sun, Teresa Cheung. Originally published in JMIR Biomedical Engineering (http://biomsedeng.jmir.org), 24.06.2021.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work, first published in JMIR Biomedical Engineering, is properly cited. The complete bibliographic information, a link to the original publication on https://biomedeng.jmir.org/, as well as this copyright and license information must be included.

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Topography of power spectrum shown in different frequency ranges. Different color scales are used for the frequency ranges to reveal the details in the central areas.