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Materials and methods are available as supporting material on Science Online.
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1642267924
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note
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To increase the signal-to-noise of the data shown in Fig. 1, we binned the data 3 x 3 pixels and then smoothed by a Gaussian function with σ = 0.5 pixel. This smoothed image was used to find the maximum outer extent of the disk. All other measurements were made using the unbinned and unsmoothed image shown in Fig. 1.
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1642269550
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note
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Supported by the NASA Origins Programme under grant NAGS-11769, and the NSF Center for Adaptive Optics, managed by the University of California at Santa Cruz under cooperative agreement no. AST-9876783. B.C.M. acknowledges support from NSF grant AST-0228963. M.C.L. acknowledges support from a Hubble Postdoctoral Fellowship (NASA Grant HST-HF-01152.01). The authors acknowledge the insightful contributions of two anonymous referees.
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