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Add 4.970m to data values 1969-2008 to refer to RLR
Subtract 2.970m from data values for 2009 to refer to RLR
Add 4.970m to data values for 2010 to refer to RLR
Subtract 2.970m from data values 2011 onwards to refer to RLR
RLR is 11.200m below primary benchmark Goteborg-Torshamnen d