Renderings of the flow field at t  =  1000. The variables shown (from left to right) are the mass fraction X₁, relative entropy fluctuations , magnitude of vorticity |ω|, and the vertical component of velocity v_y. The first three variables correspond to slices through the simulations box in the z  =  0 plane and the last one in the y  =  1.7 plane. The non-linear scaling of X₁ and |ω| and the normalisation of entropy fluctuations by their horizontal rms spread A_rms (see the colour bars) are introduced for visualisation purposes.