Distribution of absolute velocities (i.e. not projected along the line of sight) due to binary orbital motions calculated for the period, mass ratio, and eccentricity distributions of the solar-type field stars (see text; Raghavan et al. 2010; Reggiani & Meyer 2011) calculated from Eq. (3) in blue and the best-fit log-normal in green. The log-normal has a width of 0.84log ₁₀   (km   s^-1) and a mean of 0.08log ₁₀   (km   s^-1).