Linear relation between v_macro and log g (a proxy for luminosity) for the stars on Table 2. See the definition of f(T_eff) in Sect. 3.1. The orange continuous line represents our determination of a proportionality coefficient of −1.81 and a vertical shift of −0.05 km s^-1. The black dashed line is the coefficient found by Doyle et al. (2014). The light gray region is a composition of 200 curves with parameters drawn from a multivariate Gaussian distribution. The Sun is located at the origin.