Top: contour plot of the two-dimensional turbulence autocorrelation function (black) and a Gaussian fit (red); the fit is forced to be even in directions parallel and perpendicular to the mean magnetic field. The contours are drawn at 10%–90% (10% increments) of the peak b ²(0) = 0.063. Bottom: the intrinsic turbulence autocorrelation function, where we set W = 0, α = π/2, and N = 1 in Equations (19) and (21), while using the values for δ _|| and δ _⊥ obtained with the Gaussian fit (red) in the plot on the top graph (see Table 3). The contours are drawn at 10%–90% (10% increments) of the peak .