Proper motions of Gaia counterparts. We show points with available proper motion measurements (grey dots) and with good astrometry (dark blue circles) (see Sec. 2.2.6 for details). Uncertainties of the latter points are smaller than the symbol sizes. Foreground and possibly contaminated stars are excluded. For reference, we also mark group proper motions from Berlanas et al. (2023) derived from Gaia EDR3 astrometry of OB stars in Tr 14.