Emergent line profiles for strategic UV lines (N iv 1720, N v 1238,1242, O v 1371, O vi 1031,1037, and P v 1117,1128), as calculated by WM-basic (green) and FASTWIND (black), for models S30 (top), D40, S40, D50, and S50 (bottom). All profiles were calculated with a radially increasing microturbulence, with maximum value v_turb(max) = 0.1v_∞, and have been convolved with a typical rotation velocity, vsini = 100 km s^-1. The absorption feature between the two P v components is due to Si iv 1122. See Sect. 5.1.4.