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Fig. 5


XRT and MDI overlay (bottom row) showing that part of the linear feature merges with the continuous S shaped sigmoid as a consequence of the westward motion and partial cancellation of the flux at its southern end (marked by arrows). The fourth panel shows the sigmoid shortly before the eruption. There is no corresponding MDI image available. The same MDI images, including the subsequent one, taken during the eruption, are displayed in the top row for clarity.

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