Table 6: A comparison of fractionation from the accretion models. T=10 K, n(H2)=106 cm-3.
  RATE99 model NSM model
Time (yr) 104 $6\times10^4$ 104 $6\times10^4$
HD 2.94(-5) 2.13(-5) 3.05(-5) 1.77(-5)
D2 1.03(-6) 4.29(-6) 6.41(-7) 5.54(-6)
H2D+ 1.63 1.46 1.21 1.16
HD2+ 1.61 1.67 0.82 1.25
D3+ 6.46 21.7 1.00 4.96
N2D+ 2.90 8.58 0.92 2.78
DCO+ 3.06 - 0.95 -
DCS+ 1.81 - 0.65 -
D 0.21 0.76 9.29(-2) 0.18
NH2D 0.38 3.73 0.69 2.16
NHD2 0.14 3.70 0.17 1.46
ND3 2.38(-3) 0.68 6.79(-3) 0.24
ND 2.64 7.70 0.92 3.00
HDCS 0.45 - 0.27 -
D2CS 1.80(-2) - 1.65(-2) -
HDCO 0.34 - 0.25 -
D2CO 2.63(-2) - 1.37(-2) -
OD 1.30 (5.34) 0.52 (0.83)
HDO 0.57 (1.19) 0.47 (0.97)
D2O 4.86(-2) (0.73) 8.75(-2) (0.48)
HDS 0.90 - 0.90  
D2S 0.03 - 0.11  
Notes: a(-b) implies $a\times10^{-b}$; OD, HDO and D2O fractional
abundances at $6\times10^4$ yr are <10-16.

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