Effects of ɛ_CNO in the log (Ṁ) versus log (Ṁ_Vink) diagram. On the left are previous results using the solar chemical abundance (shown in Fig. 12). On the right are revised Ṁ taking different CNO values into account. Circles indicate stars with exact ɛ_CNO from Martins et al. (2015a). Crosses indicate stars for which we adopted extreme ɛ_CNO based on the results of Martins et al. (2015a). Our conclusions about weak wind in late O giants are not affected due to CNO abundances.