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. 2016 Apr 14;6:24338. doi: 10.1038/srep24338

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Copyright © 2016, Macmillan Publishers Limited

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Power spectrum derived from the near-bottom zonal velocity at M2 observed between August 25, 2013 and September 22, 2014. (b) Power spectrum of the vertically averaged zonal velocity between 40 and 450 m at M1 from May 24, 2009 to August 23, 2013, for which a 3-day low-pass filter was used at first. Dotted lines represent a significance level of 95%. Figures were plotted using MATLAB.