Fig. 3.
Panel a: fan loop system traced with black, red, and blue curved slits to perform time-distance analysis. The small white boxes locate the region used to study the steadiness of the fan loops. The contours are umbra–penumbra and penumbra–outer sunspot boundaries as described in Fig. 2. Panel b: normalised light curves in AIA 171 Å obtained for the white boxes shown in panel a.
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