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. 2023 Feb 17;120(8):e2211115120. doi: 10.1073/pnas.2211115120

Fig. 4.

Fig. 4.

As in Fig. 2, but for forecasts of the Niño 3.4 index in CCSM4. The assimilated observable is the vector of Indo-Pacific SST gridpoint values. The forecast lead times are in 3-mo increments in the range 0 to 12 mo. The verification times are shown in mm/yy date format relative to an arbitrary year in the verification interval.