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Fig. 4


Indicative images of the conspicuous vortex flow (yellow circle) at different times and wavelengths of the Hα line. Red, green, cyan, and orange circles mark the smaller observed swirls discussed in Sect. 3.2 that exhibit different morphological structures and patterns. The temporal evolution of the vortex flow in Hα line-centre intensity is shown in the left panel of the movie available online.

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