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. 2021 Jan 25;22(2):141–159. doi: 10.1007/s10162-020-00783-y

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© The Author(s) 2021

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 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. 6 — A) Phase vs frequency plots for the NDR (F2-F1 Hz, orange) and to an electrical artefact (F1 Hz, blue) in response to interleaved pulse trains having AM rates where F2-F1 is 37, 40, or 43 Hz. The abscissa shows F2-F1 Hz in orange and F1 Hz in blue. Solid lines show average data and faint lines show individual data. B) Box-and-whisker plots showing the group delay, derived from the functions shown in part A, for the NDR (orange) and F1-artefact (blue)