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Fig. 8.


Detailed study of event A. (a)–(e) The top panels show a close up of the surroundings at different time steps, t1 to t5from left to right, through the shock wave event. The time of the Tb peak is marked by t3 = 14:46:38. Here, t1 and t2 mark 70 s and 26 s prior the peak and t4 and t5 mark 26 s and 70 s after the peak. The center location is marked by a blue cross. The contour lines mark half of the maximum ΔTb peak. (f)–(g) Space-time diagrams for a vertical and horizontal slit across the FOV at the center location, which is marked with blue dots for the time steps t1 to t5. Velocity slopes for 10 and 20 km s −1 are indicated by blue dotted and white dashed lines, respectively. The color code is the same in all panels. (h) The time evolution of the brightness temperature of the center location, where the time steps t1 to t5 are indicated by blue dotted vertical lines. Both the original data (black) and the averaged data (green) are shown. The horizontal and vertical black dashed lines mark the event lifetime and brightness temperature excess.

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