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Figure: Anomaly correlations, plotted as a function of initialization month and forecast lead time, for six-month ensemble NINO3 forecasts from January 1970 through December 1990 from the Zebiak and Cane [1987] numerical model. Figure from Xue et al. [1994]. NINO3 is defined as the area averaged SST anomaly, from 5S to 5N, 150W to 90W. The March isoline is indicated by the heavy dashed line.