Panel a: time-slice images of Hα −0.26 Å intensity (black and white images) and derived Doppler velocities (coloured images) along circular slits of different radius r (in ″) from a common centre at (x, y) = (124.8″, −592″), such as the one shown in the Hα −0.26 Å image of panel b. The X-axis represents time running from the start of the observations and the Y-axis denotes the angle in degrees at the centre of the circle that is subtended by the arcs starting at the west of the image and measured in the clockwise direction. In intensity time-slice images black indicates absorbing features, while negative and positive Doppler velocities indicate respectively upwards and downwards LOS motions (the Doppler velocity scale is similar to that in Fig. 9). Panel b: indicative Hα −0.26 Å image with the circular slices of increasing radius and respective clockwise angles used for the time-slice images of panel a marked on it.
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