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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
(A) Oscillogram and (B) Spectrogram of a 6.7 s interval of sounds recorded from 10 adult S. oryzae. Darker areas in the spectrogram (calculated at 128 points/spectrum) indicate greater energy at specific frequencies and times.