Fig. 1
Left: IRS 9A: average interferogram in the image plane observed in a sparse aperture masking (SAM) data cube. Center: Fourier transform of an average interferogram. The 42 blue spots correspond to the sampled visibilities and their complex conjugates, while the central red spot is the DC component of the Fourier transform and it is proportional to the squared of the total flux in the interferogram. Right: UV coverage of our SAM observations.
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