Direct comparison of Gaia and HIPPARCOS derivation of the semi-major axis of the photocentre when both are available. The colour code is the same as in Fig. 10. Grey points indicate upper limits derived with HIPPARCOS. The red dotted line represents the equality aHIP = aGaia. The outlyingpoint with aHIP = 32 mas is HD 225239. This case is discussed in Sect. 5.
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