LCT flow speed maps of the spine of the filament (region A in Fig. 4). The LCT method was applied to the AIA λ171 Å time series for different time intervals Δ T. The time intervals are (a) Δ T = 30 min, (b) ΔT = 60 min, (c) ΔT = 90 min, and (d) ΔT = 120 min. The square-region B shows the 32 Mm × 32 Mm region of Fig. 8. The white contour outlines the filament as seen in Hα.
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