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Plots of NDJ SST anomalies for the NDJ period preceding each of the last four pandemics. (A) November 1917 to January 1918. (B) November 1956 to January 1957. (C) November 1967 to January 1968. (D) November 2008 to January 2009. SST anomalies are a statistically homogeneous concatenation of two SST reconstructions (13, 31).
