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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 5.141m to data values 1879-1933 to refer to RLR
Add 5.625m to data values 1937 onwards to refer to RLR
RLR is 9.759m below primary benchmark BM CEO (Chief Eng Offc)