[LEAPSECS] Never mind DUT1, what's up with dX and dY

[Poul-Henning Kamp]

When I look at the Bulletin-A plots at IERS:

	https://www.iers.org/IERS/EN/DataProducts/EarthOrientationData/eop.html

something obviously happened to dX and dY in 2019Q4 ?

Does anybody here know if this is an artifact of measurements/models/calculations or if is this a real change in geophysics ?

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