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Table 3.

HIPPARCOS-2 and Gaia DR2 proper motion and proper motion deduced from the difference of position.

μRA μDec

(mas yr−1) (mas yr−1)
HIPPARCOS 93.6 0.66 0.4 0.37
HIPPARCOS-Gaia 94.21 0.02 0.17 0.014
Gaia 93.8 0.1 −0.11 0.09

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