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. 2020 Jun 10;10:9404. doi: 10.1038/s41598-020-66368-0

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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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Difference between PSD (6 AM–8 PM) on a given day (top to bottom: January 21, March 10 and March 31: all are Tuesdays), and average PSD calculated for all week days (6 AM–8 PM) from 1–10–2019 to 1-4-2020. The calculation is conducted within three frequency bands (left to right: 5–10 Hz, 3–5 Hz and 3–1 Hz). Values for each station are plotted, through the shown colour code, at the station location.