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SUBTRACT 1.066m from data values up to 1952 to refer to RLR (1988)
SUBTRACT 1.089m from data values 1953-1959 to refer to RLR (1988)
Add 0.002m to data values 1960-1971 to refer to RLR (1988)
Add 3.763m to data values 1979 onwards to refer to RLR (1988)
RLR (1988) is 11.199m below TGBM SH 2553 8287