Radial profile of continuum and spectral line emission, obtained from the azimuthal average of a disk with 12° opening angle. Continuum and H₂CO emission is from the disk only, while that of CS and CN is also from the outflow cavity. Error bars are obtained by propagating the uncertainties at all angles and do not include the dispersion of the averaged sample. Only fluxes above 3σ confidence are shown. The vertical line indicates the extent over which the continuum emission is optically thick (see Sect. 3.3).