Effects of the velocity dispersion inside clumps on the line profile. Upper panel: weak lines (χ₀ = 2.5), middle panel: intermediate lines (χ₀ = 25), lower panel: strong lines (χ₀ = 250). The black dashed lines represent the smooth wind, the green dashed lines (poro) represent pure porous wind, the other lines (poro+voro) represent the porous wind with non-monotonic velocity described with m as given in the panels. ν_D = 20   km   s^-1 and other model parameters have their default values (Table 1).