Average concentration distributions of Fe ions obtained from simulation runs with gas densities of 10⁸, 10¹¹, and 10¹⁴ m⁻³ for component 3. The obtained ion concentrations are shown as red dots. The best-fit total concentration, depicted as black lines, is the sum of the two equilibrium components depicted as blue and green lines. The ionization parameters and the fractional contributions of the two equilibrium components are also shown. A single component is sufficient to fit the average concentration in the case of 10⁸ m⁻³.