Radial velocity residuals between this work and external measures: Gaia DR2 (blue squares) and previous spectroscopic measures in the literature (magenta open circles). For this comparison, we used the 42 single stars with 6D data (see Table 1). Our final sample of 26 stars is represented by the filled markers. We note that our radial velocity uncertainties (horizontal error bars) are smaller than the markers in most of the cases. The largest uncertainty corresponds to the β Pic star (see footnote 2).