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Add 8.947m to data values 1930-1963 to refer to RLR (1974)
Add 5.947m to data values 1964-1988 to refer to RLR (1974)
Add 5.951m to data values 1989 onwards to refer to RLR (1974)
RLR (1974) is 10.3m below BM F 17