Fig. 7.
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Variations in the centers (on the projected X − Y plane) of the three clumps of brightenings. The squares, triangles, and crosses are the locations of “N1”, “N2”, and “N3”, respectively. The change in time is shown as a change in color. The convergence of the three clumps can be followed in this diagram while they are moving toward the same position at the end.
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