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