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. 2017 Jan 24;7:41096. doi: 10.1038/srep41096

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Copyright © 2017, The Author(s)

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(a–e) Are the results for the five sub-regions, while (f) shows the results for the entire Antarctic. The four curves in each panel represent the p-values vs the absolute value of the dimensionless relative trend x, for four different assumptions: (i) white noise (WN, black curves), (ii) AR(1) (AR1, red curves), (iii) long-term persistent process (LTP, blue curves), and (iv) combined AR(1) and long-term persistent processes (LTP + AR1, cyan curves). The vertical dashed line in each panel shows the relative trend x of each SIE data set. The horizontal dashed line points to the corresponding p-values. The figure shows that for the most realistic scenario (iv), only the positive trends in the Ross Sea and in the entire Antarctic are statistically significant.