Condition of the plasma undergoing rotational motion within the domain, as highlighted according to the R criterion. Left; the 2.5D domain of temperature with positions of R > 5 × 10⁻² s⁻¹ and where λ_ci > 10λ_cr overlaid in white, see text for description of these terms. A few clear KH instability cells have been indicated with teal boxes. Right; the density – temperature phase space of these extracted regions. A broad distribution is present, with a clear peak at the high temperatures and low densities of the solar corona. The inset axis plots the number of distinct KH cells in time (s), current time indicated by the dashed-black line, explanation in the text. An animation of this Figure will be available online.