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Fig. 4


Fraction of carbon ionization states versus X-ray luminosity flux, FX, for a dense molecular hydrogen gas, n(H2) = 103 cm-3 and Tkin = 100 K, with an admixture n(H) = 1 cm-3 and n(e) = 0.1 cm-3. Carbon remains in the singly ionized state, C+, up to FX ~ 5 × 103 erg cm-2 s-1.

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