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. 2017 Mar 20;8:14887. doi: 10.1038/ncomms14887

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(a–d) Distribution of power spectrum for DJF Niño3.4 index (a), MAM NTA SST (b), JJA WPSH index (c) and JJA NPSH index (d). The dashed line denotes the 95% confidence interval against red noise.