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. 2015 Jul 7;6:7685. doi: 10.1038/ncomms8685

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(a) Autocorrelations of N (red circles), I₁ (blue squares), and the cross-correlation between N and I₁ (pink triangles). (b) Autocorrelation of I_en (green circles). (c) Autocorrelation of U (purple circles). The corresponding lifetime component is highlighted in the inset of each figure. The correlation curves in a were fitted with theoretical equations (20)–(22), , , and the best fits are shown with solid lines. For the data shown in b,c, each data set was fitted both with equations (25) and (26), and the fits are shown with broken and solid lines, respectively.