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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 4.303m to data values 1854-1877 to refer to RLR
Add 4.382m to data values 1878-1897 to refer to RLR
Add 4.306m to data values 1898 onwards to refer to RLR
RLR is 10.100m below primary benchmark 1801936