摘 要: | 3. Observational Evidence. Figure 7 shows the Line Island precipitation index from 1910 to 1975. This indexwas computed and combined for the precipitation stations of Fanning Island, Washing-ton Island and Christmas Island. It is defined by assigning the value of 100 to thewattest in a long series of months, say January, and the value 0 to the driest month inthe same series. The interval between the wettest and driest month of January is thus
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