Fig. 4
Panel a: running-difference image of the CME observed with LASCO C2 at 09:24 UT. The superposed red crosses represents the manually selected CME front used to fit the ellipsoid. Panel b: same image as panel a at 10:00 UT. Panel c: resulting projected ellipsoid surface with the related red crosses extracted from the CME running-difference image at 09:25 UT, and at 10:00 UT in panel d.
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