Fig. 2
Top: location of the 12.4 Mm × 12.4 Mm analysis region (black box) in the full SOT line-of-sight magnetogram (1′′ = 725 km). Bottom: histogram of measured |v| in the analysis region, over the entire 12 h dataset. The solid line shows the filtered data, while the dashed line shows the original unfiltered data. Each curve is normalised by its own maximum.
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