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Add 6.202m to data values 1966-1971 to refer to RLR (2000).
Add 6.227m to data values 1972-1975 to refer to RLR (2000).
Add 6.0m to data values 1976 onwards to refer to RLR (2000).
RLR (2000) is 9.102m below BM PSM 21764