Plots are prepared as in Fig. 3, but the vertical scales are different. (a) The detected (see text) para‐H₂O 1₁₁−0₀₀ ground‐state transition at 269.3 μm. (b) The undetected ortho‐H₂O 1₁₀–1₀₁ ground‐state transition at 538.3 μm. (c) The ratio of the para‐H₂O 1₁₁–0₀₀ to the continuum showing the fractional absorption (dimensionless scale). (d) The total IR emission (﹩\lambda > 105﹩ μm); the scale is μW m⁻² sr⁻¹. (e) The undetected O₂ 3₂–1₂ at 705.8 μm. (f) The detected O I 2p⁴:³P₀–³P₁ transition at 145.5 μm. (g) The undetected Si I 3p²:³P₁–³P₀ transition at 129.7 μm. (h) The detected CH transition at 115.8 μm.