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Time sequence of the CME event on December 27, 2008. Columns 1 and 2 correspond to COR2-B, while columns 3 and 4 correspond to COR2-A. Images on columns 1 and 3 are base-differences, while columns 2 and 4 show heights with respect to the plane of the sky, after application of the polarization technique. The color bar indicates heights |z| in units of solar radii.
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