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Fig. 4


Surface brightness profiles for two sources with observed fractions of ~30%, with masses of 1.9 × 1010 M (black solid line) and 7 × 1011 M (blue dashed line). The horizontal dashed line indicates the detection threshold. On average, there were only 2 pixels per source above the detection threshold, and over 90% are detected in less than 5.5 pixels.

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