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Add 5.281m to data values 1958-1972 to refer to RLR
Add 6.046m to data values for 1978 to refer to RLR
Add 6.059m to data values 1981-1997 to refer to RLR
Add 5.993m to data values 1998 onwards to refer to RLR
RLR is 10.700m below primary benchmark Trig