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Add 6.240m to data values 1964-1965 to refer to RLR
Add 6.107m to data values 1966-1969 to refer to RLR
Add 6.240m to data values for 1970 to refer to RLR
Add 6.107m to data values 1971 onwards to refer to RLR
RLR is 11.500m below primary benchmark SH Prefectura