Steps in the horizontal components for all sites were generally less than 3 mm although occasionally as large as 5 mm. Steps in the vertical ranged from 3 mm to as large as 19 mm showing the strong dependency of the vertical position of the antenna phase centre to the near-field EM environment. Annual signals in the horizontal components have amplitudes less than 1.6 mm while the vertical annual signal amplitudes range from 0.5 to 4.3 mm. It is significant that little energy is seen for periods exceeding a year indicating minimal, if any, random walk' behavior of monuments. Mf Tidal Estimates Ampl.
Dates give year followed by the Julian day.