Fig. 3.

Real part of the observed visibilities as functions of uv distance of the dust emission and the ¹³CO J=2→1, C¹⁸O J=2→1, SO J=5₆→4₅, H₂CO J=3₀₃ →2₀₂ lines. Blue lines represent the best fit models given in Table 2. Magenta lines represent the same models, but varying the inner radius from 0 to 2 arcsec in steps of 0.5.