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Fig. 3.


Spectral profiles sampled at the locations of the three symbols on Fig. 2 for the first, third, and fifth rasters for the Si IV 1394 Å (top row) and O IV 1401 Å (bottom row) lines. The ordering of the panels is the star, the cross, and then the triangle from left to right, respectively. These plots clearly depict the presence of the distinct secondary emission peak associated with the downflow in the first raster (solid black lines) and its disappearance through time (blue dashed lines then pink dashed lines). The vertical dashed line indicates an apparent downflow velocity of 50 km s−1, used as a threshold for super-sonic downflows in the Si IV 1394 Å line in this study, for reference.

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