Gaia Data Release 2
Free Access

Fig. 12

image

Distributions of the RMS values (top) and their statistical levels of significance (bottom) in the VSH decomposition of the proper motion vector field of the Gaia-CRF2 from l = 1 to 10. S and T refer to the spheroidal and toroidal harmonics, and T&S signifies their quadratic combination.

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