SiO model (solid lines) for the S-type AGB-star χ Cyg overlaid on observations (histograms). Models have been scaled by the indicated factor (obtained from requiring that the velocity-integrated intensities are equal to the observed ones). Also shown is the derived brightness distribution in the uv-plane (solid lines) from the model overlaid on interferometric observations using the PdBI (blue points; data from Lucas et al. 1992).
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