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Add 10.182m to data values 1930-1963 to refer to RLR (1973)
Add 5.182m to data values 1964-1996 to refer to RLR (1973)
Add 4.544m to data 1997 onwards to refer to RLR (1973)
RLR (1973) is 11.8m below BM Attach-2