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Table 1

Abundances of deuterium, 3He, and 4He at different epochs.

Chemicals Units SBBN+WMAP Protosolar cloud Local intestellar medium
(t = 0 Gyr) (t = 9.2 Gyr) (Present time)

D 105 (D/H) 2.49  ± 0.17a 2.1  ± 0.5c 2.31  ± 0.24d
2.60 b 0.98  ± 0.19e
2.0  ± 0.1f
3He 105 (3He/H) 1.00  ± 0.07a 1.5  ± 0.2c 2.4  ± 0.7g
1.04  ± 0.04b
4He Y 0.2486  ± 0.0002a 0.2703h
0.2479 b

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