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Time series of the largest vortex from the 2010 giant storm. Except for the second map, all maps of the largest vortex come from the processed NH maps (Figures 1 and 2). To better track the largest vortex, we search the ISS database and add one more map of the vortex on 8 August 2011 (second map of Figure 13), which is between the time of the first map (5 March 2011) and the time of the third map (8 January 2012).
