A time history diagnostic plot showing the evolution of oxygen states (top panel) for the collisional ionisation equilibrium (CIE) case starting at T=10⁶ K at t=0 for n_H=10^-4 cm^-3, solar enriched gas. The middle panel shows timescales including the recombination timescales of various oxygen ions (in colour), the cooling timescale, and the dynamical timescale. The bottom shows the temperature history. The CIE case rapidly cools resulting in oxygen recombining from O VIII to O I very rapidly. This figure is meant to be compared and contrasted with the next four figures here on the website.

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