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During a recent update of the data, it became clear that there had been an error in the calculation of the Revised Local Reference (RLR) factor when the National Datum Reference was changed from 'Z' to 'Tweede Algemene Waterpassing' (TAW) in 1981. As a result the RLR factor has been amended and the RLR data revised for Nieuwpoort, Oostende, and Zeebrugge. Please see the station documentation in each case.