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Density ratios of downstream over upstream X = ρd/ρu. The left and right columns are the results for the 2011 March 7 and 2014 February 25 events, respectively. The three rows from the top show X over position angle ζ. The bottom panels show the determined X over height. Solid lines in black, red and cyan are the speeds of the shock fronts derived from the 3D ellipsoid model, in accordance with the ordinate on the right-handed side.
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