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. 2019 Jun 17;6:82. doi: 10.1038/s41597-019-0089-3

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© The Author(s) 2019

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Fig. 3 — Chord diagrams of estimated migration flows during 2010–2015 based on six methods. Direction of the flow is indicated by the arrowhead. The size of the flow is indicated by the width of the arrow at its base. Numbers on the outer section axis, which give the size of migration flows, are in millions of individuals per five-year period. Sector axis limits are based on maximums over all estimation methods and all five-year periods.