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. 2017 May 19;7:2192. doi: 10.1038/s41598-017-02406-8

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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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The 120-channel superconducting quantum interference device (SQUID) biomagnetometer system used for the magnetospinography. (a) Individual SQUID sensors are arranged in an eight-by-five configuration at 20-mm intervals. Each sensor has three perpendicular pickup coils to detect magnetic fields in three orthogonal directions. (b) Overhead view of the sensor and subject as shown in Figs 1 and 5. (c) Cross-sectional image of the cryostat protrusion. The central grey area indicates the sensor array shown in (a). The sensors are arranged in the vertical direction and positioned in close contact with the upper inwall of the protrusion. The subject was in the supine position on a table with the posterior neck on the protrusion holding the SQUID sensor array inside. The upper surface of the protrusion is curved to fit the lordosis of the cervical spine. (d) Both median nerves were alternatively stimulated at the anterior of the elbow joint. Volar splints to suppress evoked movements are not shown here.