Structure functions predicted by our model compared with obserations and theory. The dotted and dashed lines show the phase structure function corresponding to the physical kernel, with the dawn and dusk configurations, respectively (see Fig. 1). Along side is the predicted structure function of Kolmogorov turbulence with a diffraction scale of 10 km, and the structure function constrained from observations in Mevius et al. (2016) with 1σ confidence region in yellow. We note that Mevius et al. (2016) observes a turnover, but does not characterise it, and therefore we do not attempt to plot it here.