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Fig. 1
Snapshots taken on 21/04/2013 at 6:01 am UT for AR 11726 (panels 1a), 2a), 3a), and 4a)) and on 21/10/2011 at 12:45 am UT for AR 11327 (panels 1b), 2b), 3b), and 4b)). These panels show the stages of our pattern recognition method based on the least-squares mapping of ellipses.
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