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Add 6.090m to data values 1929-1936 to refer to RLR
Add 4.870m to data values 1937-1965 to refer to RLR
Add 4.850m to data values 1966-1999 to refer to RLR
Subtract 0.961m from data values 2000 onwards to refer to RLR
RLR is 10.500m below primary benchmark BM d