Power spectrum analysis of subregions 11, 17, and 19 from Figure 1. Subregion 11 ia a closed-field region, subregion 17 is a mixed region, and subregion 19 is an open-field region. For each case, the figures are arranged as follows. (A) Zoomed-in view of the subregion. (B) The corresponding 2D power spectrum where the center corresponds to k = (0, 0) km⁻¹. Axis labels for k_⊥ and k_∥ are overlaid, with their lengths representing the anisotropy. (C) Smoothed 2D power spectrum with isobars (contours of equal power) overlaid to highlight anisotropy. (D) 1D power spectra for k_⊥ (blue) and k_∥ (orange). Dashed lines show the fitted slopes for each direction, matching the color of their respective spectra. The regions used for the fits are shown between the vertical lines of the corresponding color.