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Fig. 4
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Ring class examples. From left to right, unsharp-masked images of: NGC 1512 (two-armed), NGC 7552 (twoarms+), and NGC 6753 (many-armed). The bar in the top-right corner is a reference of physical size. The sigma in pixels of the Gaussian kernel used to produce the unsharp-masked image appears in the bottom-right corner.
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