Table 2: Best fit parameters.
Free parameter Value
Inclination of disc, i 74$^\circ$
Flatness of disc, $\sin^f(\theta)$ 3.8
Central mass, M* 1.35 $M_\odot$
Velocity angle, $\alpha$ 15$^\circ$
Abundance of CO* $3.5\times10^{-5}$
Abundance of CS $0.5\times10^{-9}$
Abundance of SO $2.0\times10^{-9}$
Abundance of HCO+ $1.9\times10^{-9}$
Abundance of HCN $0.2\times10^{-9}$
Abundance of HNC $0.2\times10^{-9}$
Abundance of CN $0.2\times10^{-9}$
Abundance of H2CO $0.7\times10^{-9}$
Fixed parameters  
Disc mass 0.097 $M_\odot$
Temperature slope -0.35
Temperature at 1000 AU 19.42 K
Density slope -1.8
Turbulent velocity, FWHM 0.2 km s-1
Outer radius 2000 AU
Distance 140 pc
* The main isotopic abundance has been derived from the C18O abundance
using a 16O/18O ratio of 540 (Wilson & Rood 1994).

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