HD 107146 radial profile (top) and azimuthal profiles (bottom, as per indicated regions in top panel). The shaded regions in the top panel indicate the radial span over which profiles are extracted. The shaded regions about each profile in the bottom panel show ±1σ error ranges. The vertical dashed lines indicate the PA, PA+90°, PA+180°, and PA+270°, where the PA of HD 107146 is 153.2° (see Table A.2), the horizontal purple, blue, and amber lines represent the mean profile for the inner ring, outer ring, and both ring profiles, respectively.