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. 2017 Apr 20;7:983. doi: 10.1038/s41598-017-01063-1

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© The Author(s) 2017

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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Frequency spectra of the EMP with the 250 MHz cut-off low-pass filter applied from (a) the North-South and (b) East-West probes. Several peaks are visible in the spectra, with some corresponding extremely well with the theoretical fundamental chamber resonances and their harmonics (marked on the plot). The large quantity of conductive materials within the interaction chamber is expected to allow several other resonances to be supported, to which we attribute the presence of the other spectral peaks. A 1^st degree Savitzky-Golay filter was applied in the frequency domain for noise-reduction.