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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 6.930m to data values 1968-1973 to refer to RLR
Add 4.770m to data values 1974 onwards to refer to RLR
RLR is 10.500m below primary benchmark TM 2601 2119