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. 2015 Jul 27;10(7):e0133436. doi: 10.1371/journal.pone.0133436

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© 2015 Hermannsen et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 4 — A. Total broadband energy in all frequency bands (circles) and summed energy above 1 kHz (triangles) as a function of range shown for all recordings of the 40 in³ airgun at high pressure. B. Relative values (expressed in dBs) of energy above 1 kHz compared to the total broadband energy shown as means with standard deviations (SD).