Table 9: Equivalent widths and derived line abundances for the set of O II lines used in our analysis. Line abundances refer to the microturbulence given in brackets for each star ($\xi _t$ in km s-1). Uncertainties in the line abundances come from the propagation of the uncertainties of the equivalent width measurements (see text). Some of the O II lines of the Orion stars have not been used, as they appear blended. O II  $\lambda \lambda $ 4072, 4076, and 4078 lines were ruled out in the analysis of $\tau $ Sco due to the poor quality of the CASPEC spectrum in this region. Final oxygen abundances for each star were calculated through a weighted mean of the linear values. Errors represent the statistical deviation for these mean values.
Line EW$_{\rm o}$ $\epsilon $(O)a $\Delta\epsilon$(O) EW$_{\rm o}$ $\epsilon $(O) $\Delta\epsilon$(O) EW$_{\rm o}$ $\epsilon $(O) $\Delta\epsilon$(O) EW$_{\rm o}$ $\epsilon $(O) $\Delta\epsilon$(O)
  HD 149438 ($\xi _t$ = 8.7) HD 37020 ($\xi _t$ = 6.5) HD 37023 ($\xi _t$ = 7.4) HD 37042 ($\xi _t$ = 5.5)
  $T_{\rm eff}$ = 32 000 K     log g = 4.0 $T_{\rm eff}$ = 30 000 K     log g = 4.0 $T_{\rm eff}$ = 32 000 K     log g = 4.2 $T_{\rm eff}$ = 29 000 K     log g = 4.2
O II 4638 85 8.75 0.04 - - - - - - - - -
O II 4641 127 8.65 0.04 - - - - - - - - -
O II 4661 90 8.70 0.04 80 - - 76 8.60 0.06 88 8.56 0.06
O II 4676 79 8.71 0.05 82 8.59 0.06 65 8.59 0.06 82 8.63 0.06
O II 4317 92 8.69 0.03 107 8.67 0.04 78 8.59 0.05 98 8.60 0.07
O II 4319 86 8.71 0.04 100 8.69 0.05 75 8.63 0.05 95 8.66 0.07
O II 4366 80 8.61 0.04 96 8.62 0.05 77 8.62 0.05 103 8.62 0.08
O II 4416 100 8.62 0.04 120 8.65 0.05 93 8.62 0.05 117 8.70 0.11
O II 4452 37 8.67 0.07 48 8.64 0.07 32 8.58 0.09 60 8.67 0.10
O II 4072 - - - 118 8.61 0.12 99 8.57 0.09 119 8.71 0.10
O II 4076 - - - 133 8.59 0.12 114 8.57 0.09 - - -
O II 4078 - - - 46 8.67 0.17 33 8.59 0.09 48 8.68 0.10
O II 4941 38 8.64 0.06 50 8.68 0.07 35 8.60 0.09 43 8.60 0.08
O II 4943 60 8.62 0.04 67 8.58 0.06 55 8.59 0.07 56 8.48 0.07
O II 4956 17 8.73 0.12 20 8.67 0.14 13 8.58 0.20 22 8.71 0.13
O II 4891 24 8.75 0.10 27 8.68 0.11 18 8.59 0.15 27 8.65 0.12
O II 4906 34 8.64 0.07 42 8.63 0.08 31 8.59 0.10 47 8.72 0.08
  $\epsilon $(O) = 8.70 $\pm $ 0.10 $\epsilon $(O) = 8.65 $\pm $ 0.10 $\epsilon $(O) = 8.59 $\pm $ 0.10 $\epsilon $(O) = 8.64 $\pm $ 0.10

a $\epsilon $(O) = log (O/H) + 12.		                    


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