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Fig. 17
Ionization fractions of oxygen, as a function of τRoss, for a D45 model with fX = 0.03 and 
= 3 × 106 K, with and without dielectronic recombination (DR). We note the large differences for all the stages when 
(
), particularly the change in the main ionization stage (from O v/O vi to O iv) when DR is included.
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