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DESCRIPTION:

Warm (red) and Cold (blue) Periods based on a threshold of +/- 0.5^oC for the Oceanic Niño Index (ONI) [3 month running mean of ERSST.v5 SST anomalies in the Niño 3.4 region (5^oN-5^oS, 120^o-170^oW)]

http://origin.cpc.ncep.noaa.gov/products/analysis_monitoring/ensostuff/ONI_v5.php
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