Fig. A.1
Real part of visibilities as a function of the uv distance for the blue (left) and red (right) CO(1–0) wings of IRAS F08572+3915, binned in baseline steps of 20 m. The red curve is the best fit with a circular Gaussian model. The uv tables of the two CO(1–0) wings have been re-centred to their emission centroid positions (obtained from their maps shown in Fig. 1) prior to plotting the uv visibilities in order to correctly estimate their size.
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