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Add 3.792m to data values 1954-1957 to refer to RLR
Add 3.492m to data values 1958-1965 to refer to RLR
Add 3.482m to data values 1966-1975 to refer to RLR
Add 3.412m to data values 1976 onwards to refer to RLR
RLR is 12.200m below primary benchmark 72831