Donate
Donate to PSMSL
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 3.137m from data values 1887-1936 to refer to RLR
Add 4.800m to data values 1937 onwards to refer to RLR
RLR is 10.400m below primary benchmark BM a