The [O I] fine structure line profiles in Mon R2 and M17 SW: The puzzling nature of cold foreground material identified by [12C II] self-absorption

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Table 3

Mon R2 and M17 SW background excitation temperatures for both transitions and their respective kinetic temperatures.

Positions	$T_{{e x}_{b, 63}}$ $\[T_{\mathrm{ex}_{b, 63}}\]$ ^(a) (K)	$T_{{e x}_{b, 145}}$ $\[T_{\mathrm{ex}_{b, 145}}\]$ ^(b) (K)	T_kin ^(b) (K)
MonR2 1	78	144	90
MonR2 2	140	227	152

M17SW 0	95	200	114
M17SW 1	65	113	74
M17SW 2	70	125	80
M17SW 3	86	170	102
M17SW 4	145	240	158
M17SW 5	67	117	77
M17SW 6	100	222	122

Notes. ^(a)RJ-corrected peak $T_{{m b}_{b, 63}}$ $\[T_{\mathrm{mb}_{b, 63}}\]$ shining through. ^(b)Derived from 3-level rate equation solution, see Appendix B, at $n_{H_{2}} = 10^{6} {c m}^{- 3}$ $\[n_{H_2}=10^6 \mathrm{~cm}^{-3}\]$ .

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