Fig. 3
GRAVITY interferometric data for May and August 2017. Top panels: CO spectrum of the May dataset, normalised to the continuum. Visibilities, differential phases, and closure phases are displayed in the left, middle, and right panels, respectively. The differential phases are shifted by ± 5° for clarity and are in units of degrees. Closure phases are in units of degrees. The data are smoothed to a resolution of R = 2000.
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