Comparison between the best-fitting FASTWIND models determined by KIWI-GA where optically thin clumping was assumed (green), a FASTWIND model with the same stellar and wind parameters but with a smooth wind (i.e. f_cl = 1; blue dashed line), and a smooth FASTWIND model (again) with the same stellar parameters as the KIWI-GA fit but with a mass loss rate scaled by a factor of $\sqrt{f_{\mathrm{c}\mathrm{l},\mathrm{G}\mathrm{A}}}$.