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. 2020 Apr 30;10:7332. doi: 10.1038/s41598-020-64323-7

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© The Author(s) 2020

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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Spectral properties of fast and slow amplitude modulated (AM) vocalizations. (A and B) Show the spectra of the two syllable groups, represented as colormaps. (C and D) Are median spectra of all fast and slow AM calls studied (25th and 75th percentiles shown as shaded areas). The median spectrum of 100 biosonar calls is shown in D for comparison purposes. (E) Histogram of area under curve calculated from the spectra of fast and slow AM vocalizations. The p-value of a Wilcoxon ranksum test and the d size-effect metric are provided. (F) Histogram of peak frequency in fast and slow AM calls.