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Add 5.333m to data values 1961-1963 to refer to RLR (1973)
Add 5.315m to data values 1964-1972 to refer to RLR (1973)
Add 5.312m to data values 1973 onwards to refer to RLR (1973)
RLR (1973) is 9.4m below BM Izuhara