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Fig. 4

image

Deprojected disk image from the 2015 data set showing the trace of S1 (white), S2 (black), S3 (blue), and features i (green) and ii (cyan). The dotted circles have 40 au and 63 au radial separations, and represent the limits within which the separation angle is computed between each pair of spirals (Fig. 7).

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