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The Southern Oscillation (SO) has been traditionally monitored by indices formed from surface pressure differences across the South Pacific. Several of the most-used indices of the SO are those based on the Darwin and Tahiti pressures. Recently discovered station records have doubled the length of the Tahiti-Darwin index time series to >100 yr. The quality of the early Tahiti data is considered to be sufficiently good for use as an SO index. A way of defining the high-index phase of the SO, consistent with the definition of the low-index phase and based on the distribution of Tahiti-Darwin SO index values, is suggested.