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 4

Mon R2 and M17 SW [O I] 145 μm and [O I] 63 μm background column density per position for the two layer model.

	[O I]₁₄₅		[O I]₆₃
Positions	# Back. Comp.	$τ_{b g}^{}$ $\[\tau_{b g}^\]$ ^(a)	# Back. Comp.	$τ_{b g}^{}$ $\[\tau_{b g}^\]$ ^(a)	N_bg(O⁰)^(b) (cm⁻²)
MonR2 1	3	0.8	7	42.1	5.1E+19
MonR2 2	2	0.3	7	6.3	1.3E+19

M17SW 0	3	0.3	7	11.1	1.3E+19
M17SW 1	1	0.8	2	72.1	5.0E+19
M17SW 2	1	0.7	2	48.5	3.9E+19
M17SW 3	2	0.2	3	9.7	1.3E+19
M17SW 4	2	0.3	3	5.4	9.8E+18
M17SW 5	3	0.1	3	6.6	1.3E+19
M17SW 6	2	0.4	2	13.5	1.5E+19

Notes. ^(a)τ* corresponds to the peak optical depth of the peak component, calculated from the fitted parameters according to Eq. (2). ^(b)Total column density, calculated from the sum of the three levels.

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