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Add 5.302m to data values 1988-1993 to refer to RLR
Add 5.276m to data values 1994-1995 to refer to RLR
Add 5.248m to data values 1996-1997 to refer to RLR
Add 5.276m to data values 1998 onwards to refer to RLR
RLR is 8.468m below primary benchmark BM 2