a) MDI magnetogram in the range (− 200, 200) Gauss. The dotted and solid lines mark the 40 G and 26 G contours, corresponding to the quiet-Sun level at the original resolution of the magnetogram and at the resolution of the mm data, respectively. The white circle corresponds to the BIMA primary beam of 3′ by 3′ containing flux. b) The resulting quiet-Sun mask restricted to BIMA’s primary beam. Quiet-Sun areas are white.
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