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Add 9.91m to data values 1954-1963 to refer to RLR (1974)
Add 5.91m to data values 1964-1987 to refer to RLR (1974)
Add 5.924m to data values 1988-1989 to refer to RLR (1974)
Add 5.909m to data values 1990 onwards to refer to RLR (1974)
RLR (1974) is 9.9m below BM Attach-15
FP = Fixed Point