OVI column density plotted against N_HI for radiatively cooling gases for CIE, CINe isochoric, CINe isobaric, PIE, PINe isochoric, and PINe isobaric. The z=0.2 HM01 EGB is assumed for photo-ionised cases. The gas is assumed to be solar metallicity and the cloud mass is 10⁶ solar masses. Colour indicates temperature, symbol shape indicates density, and symbol size indicates cooling time. A cooling gas will spend more time where the symbol is large, meaning that many of the strong OVI columns at intermediate temperatures (10⁵-10⁶ K) are short-lived.

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