The column headings are explained below the tables. Almost all stars have some slight displacement, noticeable only after many years of observation. The amount of displacement is measured in arcseconds.
Most catalogues list the radial velocity.
If the radial velocity is unknown, it is treated as zero in the calculation of the space velocity. For example, a primary of visual magnitude 4.5 with a companion with a visual magnitude 4.6 appears to have a visual magnitude of 3.8.