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Fig. 4
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I(C II λ7231+36+37)/I (C II λ4267) ratio (top panel) and I(C II λ3918+20)/I(C II λ4267) ratio (bottom panel) of all analyzed regions with respect to the degree of ionization P. Symbols and color bands are the same as in Fig. 3. Notice that Pequignot et al. (1991) do not include computations for the C II λλ3918, 3920 lines.
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