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Table 3

Oxygen budget of various species in ppm assuming overall [O] = 575 ppm.

Form Species Diffuse clouds Low-mass YSO High-mass YSO Shocks Comets
Dust Refr. Dust 140 140 140 140 140
Refr. Organics 50
Gas O 320 ? ? 30
H2O <1 40 ≤62 80
CO 1 100 100 100
CO2 <1 <1 <1
O-other
Ice H2O <2 38 31 323
CO <1 10 3 10
CO2 <1 24 8 30
CH3OH <1 3 4 1
O-other <1 1 1 21
UDO 115 219 226 225

Notes. See Appendix G for references to the adopted numbers in this table and their uncertainties. The ice abundances for protostars are as observed, without hiding ices in large grains.

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