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. 2023 Jan 30;36(2):175–189. doi: 10.1007/s10334-023-01063-5

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© The Author(s) 2023

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 8 — GIRF (first-order terms) spectra acquired at 11.7 T without and with lead tube (top row: − 5 to + 5 kHz interval, bottom row: zoom on the 0–3 kHz interval). The lead tube on the Z-axis led to unwanted peaks in the ~ 900–1150 Hz region. Removing the lead tube suppressed the peaks in that region but boosted some peaks at higher frequencies