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. 2018 Mar 22;8:4666. doi: 10.1038/s41598-018-22939-w

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Field monitoring effort. Vessel (grey and dark blue lines) and aircraft (light blue lines) tracks and locations where data on buoyant ocean plastic concentrations were collected (circles). Grey circles (n = 350) represent areas sampled with a single Manta net tow by 17 participating vessels, between July and September 2015. Dark blue circles (n = 76) represent areas sampled with paired Manta and paired Mega net tows by RV Ocean Starr, between July and August 2015. Light blue circles (n = 31) show locations of RGB geo-referenced mosaics collected from a C-130 Hercules aircraft, in October 2016. This map was created using QGIS version 2.18.1 (www.qgis.org).