Table 12: Preliminary set of O II lines selected for the analysis, divided by multiplets. The spectrum of the low v sin i star $\tau $ Sco was used to identify the lines. The log  gf values are from the NIST database.
Label $\lambda $ ( Å) log  gf Notes
2s2 2p2 (3P) 3p-2s2 2p2 (3P) 3d
    NIST 90 (4D0-4F)
O II 4069 4069.623 0.149 + C III
  4069.882 0.344  
O II 4072 4072.153 0.552  
O II 4076 4075.862 0.693 + C II
O II 4078 4078.842 -0.284  
    NIST 118 (2D0-2F)
O II 4699 4699.218 0.269  
  (4699.011 0.418) NIST 172
  (4698.437 -0.883) NIST 172
O II 4705 4705.346 0.477  
O II 4741 4741.704 -0.987 Very weak
    NIST 130 (4S0-4P)
O II 4891 4890.856 -0.436  
O II 4906 4906.830 -0.160  
    NIST 148 (2P0-2D)
O II 4941 4941.072 -0.054  
O II 4943 4943.005 0.239  
O II 4956 4955.707 -0.573 Very weak
2s2 2p2 (3P) 3s-2s2 2p2 (3P) 3p
    NIST 64 (4P-4D0)
O II 4638 4638.856 -0.332 + C II + Si III
O II 4641 4641.810 0.054 + N III
O II 4650 4649.135 0.308  
O II 4651 4650.638 -0.362  
O II 4661 4661.632 -0.278  
O II 4673 4673.733 -1.088  
O II 4676 4676.235 -0.394  
O II 4696 4696.352 -1.380  
    NIST 65 (4P-4P0)
O II 4317 4317.139 -0.386  
  4317.696 ...  
O II 4319 4319.630 -0.380 + N III
  4319.866 -0.502  
O II 4366 4366.895 -0.348  
  4366.530 ...  
    NIST 72 (2P-2D0)
O II 4414 4414.899 0.172  
  4414.456 -1.483  
O II 4416 4416.975 -0.076 + Si IV
O II 4452 4452.378 -0.789  


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