Fig. 1
From left to right and from top to bottom, median-averaged image obtained for comets C/2005 L3, C/2005S4, C/2007JA21, C/2007 M1, C/2008 FK75, C/2009 S3, C/2010 R1, and C/2011 L4 in the R filter. Each image has a width of 105 km at the comet’s distance, except that for comet C/2005 L3, which covers 5 × 105 km. In this image, the black box in the upper-right corner has the same size as the other images. For all the images, N is up and E is on the left. The black arrow indicates the direction towards the Sun.
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