Time-slice Ca II−0.055 Å intensity images derived from the respective unsharp-masked images (see text for details) along the same horizontal (Col. 1) and vertical (Col. 2) slits shown on the unsharpmasked Hα intensity image of Fig. 9 (Col. 1) as green lines. The slits pass from the same approximate visual centres of the chosen swirl marked by a red circle (Row 1) and the swirl marked by a cyan circle (Row 2) of Fig. 9. The yellow vertical lines indicate the borders of the conspicuous vortex flow, while vertical green lines show the approximate centre position of the respective swirl.
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