Structure functions for the directions perpendicular ﹩({\mathrm{SF}}_{2}({r}_{\perp },0);﹩ left panel) and parallel ﹩({\mathrm{SF}}_{2}(0,{r}_{\parallel });﹩ right panel) to the mean magnetic field. Here ﹩{r}_{\perp }\propto 1/{k}_{\perp }﹩ and ﹩{r}_{\parallel }\propto 1/{k}_{\parallel }﹩.