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Fig. 3


Six snapshots of the base-difference images. The white/black color indicates enhancement/decrease in brightness. The black contours correspond to intensities of 25 and 50 DN s-1. In panel c), arc1 outlined by a pair of white parallel lines connects the two endpoints, l1 in BP2 and r1 in BP1. In panels e) and f), the arrows point to the upward jet-like motion originating from BP1.

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