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. 2015 Jul 24;5:12358. doi: 10.1038/srep12358

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Copyright © 2015, 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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Track composite of hurricane and all TCs (tropical storms and hurricanes), respectively, during IPO positive (red) and negative (blue) phases over the North Atlantic (a,b) and eastern North Pacific (c,d). The maps in Fig. 1 were generated using NCAR Command Language (NCL) version 6.3.0, open source software free to public, by UCAR/NCAR/CISL/TDD, http://dx.doi.org/10.5065/D6WD3XH5.