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. 2016 Nov 17;6:35814. doi: 10.1038/srep35814

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Copyright © 2016, The Author(s)

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) Experimental time evolution of trapped particles number in different current levels. (b) Experimental time evolution of trapped particles of various sizes in same current level. Single 1.5 μm particle trajectories (shown in red line) within the METH region: (c–f) 1, 4, 11 and 20 particles are trapped at the time stamp of 33 s, 60 s, 119 s and 141 s, respectively. Time interval for the trajectory in each frame is 21 seconds. Black dashed circles indicate the trapped particles, and yellow dashed circle indicates the initial location of the trapped particle.