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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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Temporal electric field behaviour (a) calculated using the raw voltage data and (b) with a low-pass frequency filter applied to remove high-frequency electrical noise, and the contribution to the initial peak by optical self-emission coupled into the optical fibres subtracted. The time axes have been shifted such that t = 0 corresponds to the arrival of the 227 TW drive laser pulse on target. A 70^th order Blackman-Harris window filter with a cut-off frequency of 250 MHz was chosen to minimize side-lobes and hence time-domain artefacts.