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. 2019 Jul 1;9:9442. doi: 10.1038/s41598-019-45077-3

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© The Author(s) 2019

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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Velocity fields for Tunabreen calculated for the period shown in the bottom left corner of each panel are displayed. Margin positions from 1 September 2016 and the end of the velocity field calculation period are also shown, along with the mean value across the glacier front of retreat/advance between these two dates. The position of the LoTUS buoy is portrayed by a green triangle. The background images for these panels are from 9 September 2016 (A,B) and 6 April 2017 (C). The background images are Copernicus Sentinel data (2016, 2017) downloaded from the Copernicus Open Access Hub (https://scihub.copernicus.eu/). Terms of use available at https://scihub.copernicus.eu/twiki/do/view/SciHubWebPortal/TermsConditions.