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Fig. 1


Active region NOAA 10448 observed on August 31, 2003. a) BIMA image at 3.5 mm, b) MDI photospheric magnetogram and c) BBSO Ca ii K image. White contours mark sunspot umbrae and penumbrae. The box contains the region shown in Fig. 4 as a blowup. The zero brightness in the BIMA image corresponds to the weakest flux.

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