A blowup of the sunspot region marked in Fig. 1. a) BIMA image at 3.5 mm, b) BBSO Ca ii K image at the original resolution and c) the Ca ii K image convolved to the resolution of the mm image (12′′). Thick white contours mark the locations of two umbrae. The other are iso-intensity lines corresponding to 10, 20, 30, 40, 50, 60, 70% of maximum brightness for the mm image and 30, 40, 50, 60, 70% of maximum brightness for the original and convolved calcium images. The zero brightness in the BIMA image corresponds to the weakest flux.
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