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Fig. 4
UT 19 Jan. 2010 GN image of P/2010 A2 (Fig. 2.2), enhanced using unsharp masking, with a window of 20 a), 10 b) and 5 pixel radius c). Panel d) was produced by shifting the image by 1 pixel vertically and subtracting the result from the original, after rotating the image to align the tail along the rows.
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