Photocentre motion of the ξ Tau system and its influence on parallax measuments. We plot the orbital motion of individual components Aa, Ab, B, C in the barycentric frame (light gray or coloured, if within the observational timespan of Gaia), the photocentre motion (black), the parallactic motion (gray), the proper motion (light gray), and all contributions with the new parallax π′ = 14.717 mas (cyan). For comparison, we plot all contributions with the old parallax π = 16.791 mas (light cyan) and also the old trajectory from Gaia DR3 (dash-dotted).