Deviations from the smoothed X-ray emission. (Left) Unsharp mask obtained by subtracting two Gaussian convolved images (with FWHM of 2 and 20 pixels). Some of the features discussed in the text are shown. (Right) Exposure-corrected X-ray image overplotted with the best-fit 2D β −model (green contours) and the positive (red) and negative (blue) residuals at 68.3%, 90%, 95%, and 99.73% level of confidence.
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