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Temperature anomalies in °C, from the 1993-2014 annual mean, area-averaged in the Niño box 3.4 from the multi-product approach using GREP (GLOBAL_REANALYSIS_PHY_001_031). The thick black line indicates the position of the isopycnal 1025 kg/m3, and the dashed black line indicates its climatological position. Black dots mark the areas where the anomaly is at least twice the standard deviation of temperature anomalies from the four multi-product members (e.g. the standard deviation is less than 0.6°C).