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Add 2.459m to data values 1807-1856 to refer to RLR
Add 2.959m to data values 1857-1860 to refer to RLR
Add 2.459m to data values 1861-1995 to refer to RLR
Add 2.959m to data values 1996 onwards to refer to RLR
RLR is 12.500m below primary benchmark NO-47