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Add 5.998m to data values 1979-1981 to refer to RLR
Add 5.318m to data values 1983-1996 to refer to RLR
Add 5.758m to data values 2006-2007 to refer to RLR
Add 5.888m to data values 2008 onwards to refer to RLR
RLR is 8.293m below primary benchmark 014A