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. 2016 May 27;6:26681. doi: 10.1038/srep26681

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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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By integrating five RF patterns with the frequency (7, 14, 21, 28, and 35) and the corresponding amplitude (0.4, 0.2, 0.1, 0.05, and 0.025), two patterns that are similar to the original patterns in Fig. 1 can be created by changing the phase of the 2^nd and 4^th RF patterns. Specifically, in the rounded shape, the peak of the 1^st, 3^rd, and 5^th RF patterns and the trough of the 2^nd and 4^th RF patterns were aligned. The peaks of all five RF patterns were aligned for the angular shape.