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Table 8:

Abundances, relative to solid H2O and total H, of the S-bearing species detected in the icy grain mantles.

Source 		Abundances
  N(OCS)/N(H2O) N(SO2)/N(H2O) N(OCS)/N(H)a N(SO2)/N(H)a

Mon R2 IRS 2 		$5.5 \times 10^{-4}$b   $3.2 \times 10^{-8}$b  
AFGL 989 $1.0 \times 10^{-3}$b   $2.3 \times 10^{-8}$b  
W33A $4.0 \times 10^{-4}$b ( $3.1 \pm 1.6)\times 10^{-3}$c $7.0 \times 10^{-8}$b ( $6.2 \pm 3.2) \times 10^{-7}$c
NGC 7538 IRS 1 < $5.0 \times 10^{-4}$d ( $8.0 \pm 2.0) \times 10^{-3}$c < $7.6 \times 10^{-9}$d ( $1.2 \pm 0.3) \times 10^{-7}$c
NGC 7538 IRS 9 $5.0 \times 10^{-4}$e < $5.0 \times 10^{-3}$c $3.4 \times 10^{-8}$e < $3.4 \times 10^{-7}$c

Notes. (a) N(H) column densities are taken from Tielens et al. (1991) and Boogert et al. (1997); (b) Palumbo et al. (1997); (c) Boogert et al. (1997); (d) Gibb et al. (2004); (e) Charnley et al. (2001).


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