Comparison of Gaia DR1 excess noise with Gaia DR2 renormalized unit weight error (see text for explanation). Only systems with a short orbital period (<670 days) and which are part of the TGAS sample are compared. For longer period systems or for those of which HIPPARCOS positioning was not taken into account, the orbital motion could have been modelled out of the DR2 or the DR1 data by fitting the proper motion. The outlying HD 71827 case is discussed in the text.
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