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Add 4.557m to data values up to 1957 to refer to RLR (1971)
Add 4.575m to data values 1958-1973 to refer to RLR (1971)
Add 4.054m to data values 1974 onwards to refer to RLR (1971)
RLR (1971) is 10.808m below TGBM NZ 3592 6823