Table 5: Observed ice composition towards Elias 16, expressed as a percentage of H2O abundance 1.

Species		 Elias 16 Model M2
    $2\times10^{5}$ yr $2.8\times10^{6}$ yr

H2O 2,3		 1.28(-4) 3.47(-5) 1.50(-4)
CO 3 26 7.4 0.3
CO2 4 20 4(-2) 0.3
CH4 5 - 20.7 28.5
CH3OH 5 <3 6.4 10.5
H2CO 5 - 5.7 1.0
H2O2 5 <5 3(-4) 5(-5)
OCS  5 <0.2 9(-13) 6(-14)
NH3 5 <9 12.6 7.3
1 $a(b) = a \times 10^{b}$; 2 H2O fractional abundance; 3 Ref. Nummelin et al. (2001);
4 Ref. Bergin et al. (2005); 5 data collated by Gibb et al. (2000)

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