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Variation in separation distance (in unit of R⊙) between the two tracked features with time. Each panel shows computed separation of the two features, based on the use of different methods for the estimation of distance of tracked Feature 1 and Feature 2. From top to bottom, panels correspond to SSSE, TAS, GT (twin spacecraft reconstruction), HM, SSE, FP and PP (single-spacecraft reconstruction) methods. In the four panels from bottom to top, the results derived by implementing the methods on STEREO-A and STEREO-B observations are shown with triangles and pluses, respectively.
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