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Add 5.900m to data values 1934-1970 to refer to RLR
Add 6.000m to data values for 1971 to refer to RLR
Add 5.900m to data values 1972-1973 to refer to RLR
Add 6.200m to data values 1974 onwards to refer to RLR
RLR is 8.300m below primary benchmark DET 9