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Add 5.878m to data values 1967-1972 to refer to RLR
Add 5.740m to data values 1979-1997 to refer to RLR
Add 5.634m to data values 1998-2002 to refer to RLR
Add 5.924m to data values 2003 onwards to refer to RLR
RLR is 11.200m below primary benchmark TG Pit