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In page Proxy (climate):
"In addition to oxygen isotopes, water contains hydrogen isotopes – 1H and 2H, usually referred to as H and D (for deuterium) – that are also used for temperature proxies. Normally, ice cores from Greenland are analyzed for δ18O and those from Antarctica for δ-deuterium. Those cores that analyze for both show a lack of agreement.[citation needed] (In the figure, δ18O is for the trapped air, not the ice. δD is for the ice.)
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