Line-broadening characterization via ν sin i and ν_mac of a sample of 430 Galactic O and B stars. Crosses correspond to stars for which only an upper limit in ν_mac could be determined. Various colors and lines separate stars affected by a different relative rotational and macroturbulent broadening contribution. The 25 km s^-1 horizontal and vertical lines indicate conservative limitations of the performed methodology (see main text for explanation). Gray-shadowed region groups stars with an important macroturbulent (compared to rotational) broadening contribution.