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Fig. 1

image

Physical quantities as a function of number density in a one-zone calculation, irradiated by a strong T5 background, using our modification of KROME. A: temperature; B: self-shielding factor for H2, fsh (fsh = 1 means no shielding, and the smaller fsh, the stronger the shielding); C: number fractions of H species (and electrons); D: number fractions of He species.

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