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FIG. 18. Equatorial depth-longitude section of ocean temperature anomalies for (a) DJF 1998/99, (b) MAM 1999, (c) JJA 1999, and (d) SON 1999. Contour interval is 1C. The dark line is the 20C isotherm. Data are derived from an analysis system that assimilates oceanic observations into an oceanic GCM (Behringer et al. 1998). Anomalies are departures from the 1983–92 base period means.