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