Illustrative examples of the various types of line profiles found in the IACOB sample of O- and B-type stars. The values of ν sin i and ν_mac resulting from the line-broadening and line-asymmetry analyses (see Sect. 3) are quoted in the lower right corners. Each profile was selected to be a representative of the six regions indicated in Fig. 4 (the same color and A)−B) label codes are used here). The profiles are organized from bottom to top and from left to right, following an increasing sequence of ν_mac and ν sin i, respectively.