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. 2018 Jul 27;8:11317. doi: 10.1038/s41598-018-29343-4

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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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The study area. (a) Bathymetry of the Ionian Sea. The red dots indicate the CTD casts we consider in this work (collected from 1977 to 2011); the yellow line indicates the bathymetric section of panel (c). (b) Zoom-in of the study area with the deep CTD casts (those reaching 4000 m depth); colors correspond to the temperature and salinity profiles in Figs 2a,b and 4a. Maps are generated by IDL 8.0 (www.harrisgeospatial.com/IntelliEarthSolutions/GeospatialProducts/IDL.aspx).