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Add 4.622m to data values up to 1978 to refer to RLR (1986)
Add 4.152m to data values 1979-1980 to refer to RLR (1986)
Add 4.132m to data values 1981 onwards to refer to RLR (1986)
RLR (1986) is 10.5m below TGBM NB 4228 3264