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Age model
4
Calculated
Drilling/drill rig
4
Ice_core_diverse
4
Sampling/drilling ice
4
Age model, optional
2
Antarctica
2
DEPTH
2
DEPTH, ice/snow
2
DRILL
2
Mass spectrometer Finnigan MAT 251
2
Vostok
2
ice/snow
2
optional
2
δ18O
2
Age
1
Age, difference
1
difference
1
gas
1
δ15N
1
δ15N, gas
1
δ18O, gas
1
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