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Left panels: The significance level for the time-lagged cross-correlation after 10,000 MC-iterations for 2-sector structures in the period 1968–2020 in the NH for the months DJF (top panel), MAM (middle top panel), JJA (middle bottom panel), and SON (bottom panel). FDR interval is set between lead and lag −13 to +13. Left middle panels: Same procedure for the 4- or irregular sector structures in the NH. Right middle panels: Same procedure for the 2-sector structures in the SH. Right middle panels: Same procedure for the 4- or irregular sector structures in the SH.
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