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Add 7.780m to data values 1992-1993 to refer to RLR
Add 7.710m to data values 1994-1998 to refer to RLR
Add 7.765m to data values 1998-2005 to refer to RLR
Add 7.585m to data values 2005 onwards to refer to RLR
RLR is 10.700m below primary benchmark BM A