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Add 3.499m to data values 1955-1964 to refer to RLR
Add 3.493m to data values 1965-1968 to refer to RLR
Add 3.488m to data values 1969-1972 to refer to RLR
Add 3.474m to data values 1973 onwards to refer to RLR
RLR is 11.904m below primary benchmark BM Monbetu (i)