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Table 4

Column densities and upper limit of AAN detection in various astrophysical environments.

Column density (molecule cm-2) HH 46 NGC7538 W33A

N(H2O)a 8.0  ×  1018 6.8  ×  1018 9.0  ×  1018
Nlimit(AAN)/N(H2O)b (%) 6 7 9
N(CO2)/N(H2O)a (%) 32 24 16
N(CH3OH)/N(H2O)a (%) 7 7 22

Notes. 

(b)

Nlimit(AAN): detection limit of AAN, assuming the S/N of the ISO satellite is 40 times lower than ours. Nlimit(AAN) = Nlimit   lab(AAN)  ×  40 = 5  ×  1017 molecule cm-2.

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