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|bibcode=2011A&A...535A.107K
|doi=10.1051/0004-6361/201117373
}}</ref> Compared to the thin disk, thick disk stars typically have significantly lower levels of [[metallicity|metals]]—that is, the abundance of elements other than hydrogen and helium.<ref name="freeman2010">
{{cite book
| last1=Freeman | first1=K. C.
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