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Add 4.080m to data values 1915-1980 to refer to RLR
Add 3.639m to data values 1981-1983 to refer to RLR
Add 2.236m to data values for 1984 to refer to RLR
Add 3.899m to data values 1985 onwards to refer to RLR
RLR is 11.700m below primary benchmark SW 4676 2855