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. 2018 Sep 19;204(11):905–914. doi: 10.1007/s00359-018-1287-8

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© The Author(s) 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 5 — Attenuation through pipes as a function of distance and frequency. Tones with frequencies of 0.5, 3.1, and 10.6 kHz were played through plain PVC pipe (dashed lines with open symbols, “P” in the legend) or played through PVC pipe lined with soft rice paper (solid lines with solid symbols, “R” in the legend)