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. 2015 Oct 9;1(9):e1500646. doi: 10.1126/sciadv.1500646

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Copyright © 2015, The Authors

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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Fig. 1 — The monthly mean precipitation series is averaged over 5°W to 20°E, 10° to 20°N, and τ_d is averaged over 10° to 65° W and 0° to 30°N. The thin lines are the seasonal means, and the thick lines are the five-season smoothed time series (via a 1-4-7-4-1 filter).