Table 2: Strongest detected water emission lines. Various spectroscopic characteristics of the detected lines are also provided. The last column lists estimates of the critical density $n_{{\rm crit}}$ assuming $T_{{\rm gas}}=1000$ K and $\sigma \simeq 10^{-15}$ cm-2.
Line Nuclear state Transition(u $\rightarrow$l) Wavelength $E_{{\rm upper}}$ $E_{{\rm lower}}$ $A_{{\rm ul}}$ $n_{{\rm crit}}$
    $(v_1 v_2 v_3)\ J\ K_a K_c\ -\ (v_1' v_2' v_3')\ J'\ K_a' K_c'$ (micron) (cm-1) (cm-1) (s-1) (cm-3)
1....... ortho-H2O (001) 15 6 10-(000) 14 4 11 2.28020 7131.63 2746.02 9.50 $\times$ 10-2 9.50 $\times$ 108
2....... ortho-H2O (001) 15 7 9-(000) 14 5 10 2.28076(1) 7302.72 2918.24 8.88 $\times$ 10-2 8.88 $\times$ 108
3....... ortho-H2O (001) 16 5 11-(000) 15 3 12 2.28093(1) 7464.48 3080.18 8.27 $\times$ 10-2 8.27 $\times$ 108
4....... ortho-H2O (001) 14 8 6-(000) 13 6 7 2.28449(1) 7133.78 2756.41 6.56 $\times$ 10-2 6.56 $\times$ 108
5....... ortho-H2O (100) 18 7 12-(000) 17 4 13 2.28462(1) 8394.96 4017.90 2.00 $\times$ 10-1 2.00 $\times$ 109
6....... ortho-H2O (001) 12 9 3-(000) 11 7 4 2.28694 6694.58 2321.90 1.88 $\times$ 10-2 1.88 $\times$ 108
7....... ortho-H2O (001) 14 5 10-(000) 13 3 11 2.28744 6619.79 2248.06 6.24 $\times$ 10-2 6.24 $\times$ 108
8....... ortho-H2O (001) 13 8 6-(000) 12 6 7 2.29036 6799.95 2433.80 4.65 $\times$ 10-2 4.65 $\times$ 108
9....... ortho-H2O (001) 13 4 10-(000) 12 2 11 2.29134 6139.03 1774.75 3.20 $\times$ 10-2 3.20 $\times$ 108
10..... ortho-H2O (001) 18 7 11-(000) 17 5 12 2.29180 8537.65 4174.38 3.21 $\times$ 10-1 3.21 $\times$ 109

Note 1 Blended lines.

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Article Contents
1 Introduction
2 Observations
3 Chemical modeling
4 Results of the chemical model calculations and discussion
5 Conclusion and future prospects
References
List of tables
List of figures