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Table 1.

Reference configurations used to build up the MCDF active space for O I–O VII.

Ion Reference configurations
O I 2p4, [2s]2p5, [2s]22p6, [1s]2p5, [1s][2s]2p6
O II 2p3, [2s]2p4, [2s]22p5, [1s]2p4, [1s][2s]2p5, [1s][2s]22p6
O III 2p2, [2s]2p3, [2s]22p4, [1s]2p3, [1s][2s]2p4, [1s][2s]22p5
O IV 2p, [2s]2p2, [2s]22p3, [1s]2p2, [1s][2s]2p3, [1s][2s]22p4
O V 2s2, 2s2p, 2p2, [1s]2s22p, [1s]2s2p2, [1s]2p3
O VI 2s, 2p, [1s]2s2p, [1s]2p2
O VII 1s2, 1s2s, 1s2p

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