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Table 8:

Comparison of the derived molecular fractional abundances with other published results.
  CS HCN SiO SiS SO SO2 CN
This work (case A) 3.0 $\times$ 10-7 1.4 $\times$ 10-6 1.3 $\times$ 10-5 1.3 $\times$ 10-6 7.8 $\times$ 10-7 1.4 $\times$ 10-5 1.6 $\times$ 10-7
This work (case B) 8.1 $\times$ 10-8 4.3 $\times$ 10-7 5.1 $\times$ 10-6 3.7 $\times$ 10-7 2.7 $\times$ 10-7 4.2 $\times$ 10-6 5.1 $\times$ 10-8
(1) 1.0 $\times$ 10-7 9.8 $\times$ 10-7 1.7 $\times$ 10-5 4.4 $\times$ 10-7 2.6 $\times$ 10-6 - -
(2) 3.0 $\times$ 10-7 6.0 $\times$ 10-7 - 7.0 $\times$ 10-7 - - -
(3) - - 3.0 $\times$ 10-6 - 1.8 $\times$ 10-6 4.1 $\times$ 10-6 -
(4) 2.9 $\times$ 10-7 1.4 $\times$ 10-7 3.2 $\times$ 10-5 3.5 $\times$ 10-6 9.1 $\times$ 10-7 2.2 $\times$ 10-7 $3\times10^{-7}$
(5) 2.8 $\times$ 10-7 2.1 $\times$ 10-6 3.8 $\times$ 10-5 3.8 $\times$ 10-10 7.8 $\times$ 10-8 - $2.4\times10^{-10}$

Notes. In the first part, we list results derived from an observational analysis, in the second part theoretical predictions from chemical models. Abundances from the chemical models by Duari et al. (1999) were selected at a radius of 2.2R* ( $5\times10^{13}$cm).

References. (1) Bujarrabal et al. (1994); (2) Lindqvist et al. (1988); (3) Omont et al. (1993); (4) Willacy & Millar (1997); (5) Duari et al. (1999).


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