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DEPTH
2
DRILL
2
Drilling/drill rig
2
GISP
GISP2
2
GRIP/GISP/NGRIP
2
Greenland Ice Core Projects
2
Sampling/drilling ice
2
ice/snow
AGE
1
Argon/Nitrogen ratio
1
Carbon dioxide/Nitrogen ratio
1
Gas age
1
Nitrous oxide
1
Oxygen/Argon ratio
1
Oxygen/Nitrogen ratio
1
Standard deviation
1
adjusted/corrected
1
gas
1
δ15N
1
δ18O
1
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