Fig. 2
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Unsharp-masking tests. We used an F814W ACS/WFC image of NGC 1097. From left to right and top to bottom: Resultant unsharp-masked image for a Gaussian kernel with a width of 3, 5, 10, 15, and 20 pixels, respectively. The bar in the top-right corner of the first image is a reference of physical size; the scale is the same for all the images.
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