Fig. 3
Eccentricity of the outer ring. Left: surface brightness of the outer disk region in polar coordinates after de-projection and subtraction of a Gaussian ring centered at r = 200 au. The dot-dashed green line is the best fit of the outer ring with an eccentricity of 0.07 (see Sect. 4 for details). Right: surface brightness with the eccentric ring overlaid.
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