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Table 3

DCO+ best approximation model parameters.

Parameter IRAS 16293−2422 VLA 1623−2417
Tpeak (K) 17–19 11–16
Drop boundaries:
Tsub (K) 35 35
nde (cm−3) ≤106 3 × 106
CO abundance:
Inner Xin 10−5 10−5
Drop XD 10−6 10−7
Outer X0 10−4 10−4

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