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Excess brightness images used to determine the density excess ρe. The upper and lower panels show two different events on 2011 March 7 and 2014 February 25, respectively. Dots in red are the points where the ρe measurements have been made. Solid lines refer to the projected shock front determined with the ellipsoid model. Dashed lines represent the ±4% error in the geometry of the shock fronts.
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