Impact of structure on the radial intensity profiles. Shown are azimuthally averaged radial intensity profiles for C18O J = 2−1 for models with an inclination of 45° at different times in the post-burst phase. Density structures from left to right: rotating envelope with a disk component, rotating envelope without a disk, a spherical symmetric envelope (all models include an outflow cavity). The large dot in each profile indicates the R50% radius corresponding to the value given in the legend.
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