Fig. 6
Surface brightness of the disk after subtracting a Gaussian fit to the median radial profile, shown in polar coordinates with the position angle relative to the major axis of the disk on the x-axis and the radial distance from the center on the y-axis. Contours of the best-fit 2D Gaussian are show at values of [0.25, 0.5 and 0.75] times its peak value.
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