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Add 10.753 m to data values 1911-1936 to refer to RLR (1964)
Add 5.07 m to data values 1937-2008 to refer to RLR (1964)
Add 1.2 m to data values 2009 onwards to refer to RLR (1964)
RLR (1964) is 11.2m below BM a