Evolution of Doppler shifts vs. time between 12:06 UT and 12:53 UT. Top panel: Hα Doppler map, showing four points in the tornadoes (A–D), where the variation of the Doppler shift was measured. Middle panel: variation of the Doppler shift at points A (solid line) and B (dashed line). Bottom panel: variation of the Doppler shift at points C (solid line) and D (dashed line). See the colour bar in Fig. 5.
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