CO 2D Gaussian model (coloured ellipses) in the (u, v) plane for the observed visibilities of the four bandheads (coloured circles). Visibility values (from 0 to 1) of both model and observations are shown in scale from blue to red. Visibility uncertainties are represented with different diameters (see red circle at the bottom right of the plot for an uncertainty average value of 0.03).
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