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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.
Subtract 2.285m from data values 1960-1974 to refer to RLR
Add 1.802m to data values 1975 onwards to refer to RLR
RLR is 13.900m below primary benchmark SD 4030 6012