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Add 4.155m to data values 1964-1966 to refer to RLR (1964)
Add 4.179m to data values 1967-1972 to refer to RLR (1964)
Add 3.75m to data values 1973 onwards to refer to RLR (1964)
RLR (1964) is 11.4m below BM NT 1000 8171