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If the image above appears blurry, or you would like to see a larger image, please view the full-sized image of the RLR diagram.
Add 4.155m to data values 1964-1966 to refer to RLR
Add 4.179m to data values 1967-1972 to refer to RLR
Add 3.750m to data values 1973 onwards to refer to RLR
RLR is 11.400m below primary benchmark NT 1000 8171