The grayscale map represents the local noise as measured in the (primary beam corrected) Boötes field image. The overplotted contours mark lines of equal rms at [1.0,1.4,2.0,2.8,4.0] mJy beam-1 (white above 2.0 mJy beam-1). The local enhancements in rms coincide with the positions of the brightest sources.
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