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Maps of vertical component of the current density J z for the AR NOAA10019 as measured on July 3 (a), 4 (b), 5 (c), and 6 (d), 2002, as indicated in Figure 2. The sunspot umbral and penumbral boundaries are marked by the contour lines of the visible light intensity (white line). For each snapshot, boxes indicate the portion of image used for the analysis.
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