ATOMIUM: Probing the inner wind of evolved O-rich stars with new, highly excited H2O and OH lines

Open Access

Fig. 18

Negative optical depths as in Fig. 17 at 262.898 and 263.451 in the (010) vibrational state. The quantum numbers of these transitions are preceded by the letters ρ and ο for para and ortho H₂0. (The molecular H₂ density is obtained by dividing the water abundance by 3 × 10⁻⁵.)

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