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. 2021 Feb 24;11:4437. doi: 10.1038/s41598-021-83225-w

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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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(A) Basilar membrane length is plotted against diameter A. No correlation was noted between these values (r = 0.18). (B) Table showing mean angular frequencies obtained from ten specimens imaged using synchrotron radiation phase-contrast imaging. (C) Average basilar membrane and spiral ganglion frequencies plotted against cochlear angular depth. This average curve was determined by calculating the mean angular depth of each frequency in all samples. (D) Results of least squares fitting an exponential function to 3D SR-PCI SG tonotopic data. Greenwood’s function for the BM tonotopic distribution is illustrated in green for reference, and the SG function relating proportional length to tonotopic frequency developed herein is illustrated in orange.