Fig. 7

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I(C II λ6578)-I(C II λ3918+20)/I(C II λ4267) ratio for all observed regions with respect to the degree of ionization P. Symbols and colorbands are the same as in Fig. 3. The blue band shows the theoretical ratios expected when adopting the atomic data of D00. Note that Pequignot et al. (1991) did not carry out calculations of C II λ3918+20.
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