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. 2015 Dec 11;5:17491. doi: 10.1038/srep17491

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Regression slopes are shown for the 90^th-percentile (a), 50^th-percentile (b), and 10^th-percentile (c). Stippling indicates significance at the 5%-level and grey contour lines denote EKE climatology in winter. Land regions higher than 1 km have been masked. All maps are created using the open source software R.