Distribution of radial-velocity standard deviations for stars in the Gaia DR2 database with similar temperatures and magnitudes to RAVE J1830−4555 (see text for details). The number of objects, mean, and standard deviation of the distribution are listed. The vertical solid line marks the ﹩\sigma ({V}_{\mathrm{rad}}^{t})﹩ value for RAVE J1830−4555 .