Gaia Data Release 1
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Table 4

Systematic differences (Hipparcos – TGAS) between the astrometric parameters for 134 stars in the Pleiades field.

Diff. Mean units

dϖc 0.60 ± 0.12 1.27 mas
dμα ∗ ,c 0.22 ± 0.14 1.58 mas yr-1
dμδ,c 0.01 ± 0.15 2.06 mas yr-1

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