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Table 10

Degree of CO depletion and deuterium fractionation.

Source fD RD(HCO+) RD(N2H+)

IRAS 05399-0121 3.2 ± 0.7 0.020 ± 0.004 0.207 ± 0.046
SMM 1 1.9 ± 0.3 ... 0.992 ± 0.267
SMM 3 10.8 ± 2.2 ... 0.338 ± 0.092
IRAS 05405-0117 3.6 ± 1.2 ... 0.035 ± 0.006
SMM 4 ... ... ...
2nd v-comp. 3.6 ± 1.2 0.010 ± 0.006 0.950 ± 0.302
SMM 5 3.6 ± 1.4 ... ...
SMM 6 4.2 ± 1.3 ... 0.587 ± 0.084
Ori B9 N 2.1 ± 0.8 ... ...
2nd v-comp. 0.8 ± 0.3 ... ...
SMM 7 1.6 ± 0.5 ... ...

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