Add 4.011m to data values 1965-1977 to refer to RLR<br>Add 4.013m to data values 1978-1980 to refer to RLR<br>Add 4.012m to data values 1981-1991 to refer to RLR<br>Add 4.011m to data values 1992 onwards to refer to RLR<br>RLR is 8.500m below primary benchmark BM Odomari