Direct shape comparison of bright and faint spots from the CCD E2V-250. The leftmost image is the average of 200 s exposures; and the middle one averages 20 s exposures; the rightmost image is the difference after proper scaling of 200 s spot image minus 20 s spot images. The broader wings and lower peak of the bright spot clearly show up. Since the images required a small alignment prior to subtraction, we have shifted both averages by half their separation, so that resampling affects both in the same way.
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