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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 5.818m to data values 1811-1881 to refer to RLR
Add 6.891m to data values 1882-1944 to refer to RLR
Add 1.953m to data values 1951 onwards to refer to RLR
RLR is 9.900m below primary benchmark BM iron bolt