Table 7: Comparison of mean published CNO abundances for OBA supergiants (expressed as log  $\left(\frac{N_{\rm x}}{N_{\rm H}}\right) + 12$).
Author Stellar group C N O N/C N/O
This work Gal BSGs 7.79 8.12 8.68 +0.57 +0.26
Crowther et al. (2006) Gal BSGs 7.87 8.33 8.47 +0.68 +0.59
Trundle et al. (2004, 2005) SMC BSGs 7.27 7.71 8.13 +1.38 1.04
Evans et al. (2004) LMC OBSG 7.49 8.55 8.02 +1.28 +1.26
Evans et al. (2004) SMC OBSG 7.30 7.94 8.01 +0.86 +0.66
Venn (1995) Gal ASGs 8.14 8.05 - +0.13 -
Venn (1999) SMC ASGs - 7.33 8.14 - -0.08

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