CNO content of the winds of rotating massive stars from the Geneva group. In all panels, yields are for stars of 120 M_⊙ (thick dotted), 80 M_⊙ (thick dashed), 60 M_⊙ (thick solid), 40 M_⊙ (thin solid), 25 M_⊙ (thin dashed) and 15 M_⊙ (thin dotted). The curves connect yields that are provided at three values of the metallicity Z (Z = 10^-8, 10^-5, 0.02). The thick dots correspond to yields averaged over a Salpeter IMF; average values depend little on metallicity, because they are always dominated by the extremely high yields of the most massive stars.