Tidal data:
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The data is from two identical gravimeters, which sat next to each other for about a month.
There is a jump in the measurements of one of these, where it stopped measuring for a while.

Note that the gravity measurement drifts in time, due to their very sensitive springs. This
trend has to be removed from data, which also means, that the absolute value stops having
great significance, and that only the variations can be used. However, they contain all the
interesting information....